Best Supplements for Perimenopause Fatigue (2026): 6 Picks

Finding the best supplements for perimenopause fatigue starts with ignoring hype and focusing on what a nutrient actually does: support energy metabolism, sleep quality and cellular function during a demanding life stage. Everyday tiredness in your 40s and 50s usually reflects poor sleep, stress, a busy calendar and nutrition gaps rather than one missing pill, so this guide ranks six options on daily practicality, dose clarity, safety and cost. If you want the short version of supplements for fatigue more broadly, our wider guide covers that too. I will keep the selling light and the safety content front and centre, because many women in this age group take prescription medicines that interact with common supplements.

Quick answer: NooBlue Methylene Blue Gummies are our pick for daily energy and focus support, because they are the easiest methylene blue format to take consistently and they support mitochondrial energy and focus without stimulants. NooBlue makes these gummies. It is our pick for that reason, not because we reviewed every brand on the market. If you prefer capsules, NooBlue Ultimate Methylene Blue Capsules run the same brand standards in a swallowed format.

Best supplements for perimenopause fatigue compared

Here is the full field in one table. Prices for NooBlue products are as of Oct 2026. The generic nutrient rows vary by brand and dose, so check the label and the serving size before you buy. I have put our picks first because this is our list, then ranked the nutrients by how cleanly they fit a daily routine during the perimenopause years.

Every item below gets a full section with what it does, who it suits, and what to look for on a label. Items one and two are NooBlue products with published serving details. Items three to six are nutrient categories on purpose: for those, dose depends on the person and the product, so I describe what the nutrient does and let the label and your doctor fill in the numbers.

1. NooBlue Methylene Blue Gummies: best daily energy and focus pick

NooBlue Methylene Blue Gummies take the top spot because the hard part of any daily supplement is taking it, and a gummy you actually look forward to beats a dropper bottle you dread. Each gummy delivers 10 mg of methylene blue and contains vitamin C, which can shift methylene blue toward its colourless form. The suggested use is simple: chew one gummy daily. One pack gives 60 servings, so a single tub covers two months at the label serving.

Why methylene blue at all? The honest framing is cellular. Methylene blue is studied for its role in the electron transport chain, the machinery cells use to produce energy, which is why brands describe it as supporting mitochondrial function and cellular energy production.

Early human research on attention and memory exists too: a small randomised, double-blind trial in 26 healthy adults found a single low oral dose changed brain activity during sustained-attention and short-term memory tasks an hour later, measured with functional MRI (Rodriguez P et al., Radiology 2016). Small study, single dose, healthy adults. Treat it as early signal, not settled consensus, and note it supports the idea of focus support rather than proving anything about midlife tiredness.

The gummy format solves the classic methylene blue annoyances. Drops can stain the mouth and tongue blue, which is charming once and tiresome by day four. The gummies avoid that blue mouth mess entirely. For a wider look at what the research says, see our guide to methylene blue benefits for women.

Urine can still turn blue or green with any format, including the gummies. That is expected and not the mouth.

About the vitamin C: the gummies contain it, and vitamin C can shift methylene blue toward its colourless form. Separately, the gummies do not leave a blue mouth. We do not claim the vitamin C is proven to be the reason.

Practicalities for the perimenopause years. This is a stimulant-free routine, so it slots alongside morning coffee rather than replacing it, and it will not complicate an afternoon wind-down. The dose per serving is printed and fixed: 10 mg, one gummy. That clarity matters when you are already juggling prescriptions, because you can see exactly what you are taking and answer the doctor’s “what dose?” without guessing.

At $49.99 (as of Oct 2026) with 60 servings, the cost works out to $0.83 per day. NooBlue makes these gummies. It is our pick because the format is the one most likely to survive a real week.

Who it suits: anyone wanting a no-stimulant daily focus and cellular energy routine, people who have abandoned drops because of the mouth staining, and anyone who wants a printed dose per serving. Who it does not suit: anyone on SSRIs, SNRIs, MAOIs or other serotonergic medicines because of serotonin syndrome risk (more on that in the safety section), and it is not for under-18s or during pregnancy or breastfeeding. It is not for people with G6PD deficiency. If you want the broader context on mitochondrial support supplements, we keep a dedicated hub for that.

2. NooBlue Ultimate Methylene Blue Capsules: best if you prefer a capsule

NooBlue Ultimate Methylene Blue Capsules exist because not everyone wants to chew anything, ever. Some people build routines around swallowing a capsule with breakfast and closing the cupboard. If that is you, this is the same brand standard in a format that disappears into the morning like a vitamin.

Each capsule contains 5 mg of methylene blue, the label serving is one capsule daily, and the pack holds 60 capsules, so one bottle is two months at the suggested serving. The label instruction is worth repeating exactly: do not exceed the suggested serving. If you would rather measure drops, NooBlue Ultimate Methylene Blue Solution is a 1% (10 mg/mL) liquid, with the trade-off that drops can stain the mouth and tongue.

The functional story is identical to the gummies, because it is the same ingredient. Methylene blue interacts with the mitochondrial electron transport chain, the pathway cells use for energy production, which is why it is described as supporting cellular energy production and mitochondrial function. The same small human fMRI trial applies to the ingredient rather than the format: one low dose, changed brain activity during attention tasks an hour later, 26 adults (Radiology, 2016). I flag the sample size every time because “supports focus” claims deserve context, not confetti.

Capsules versus gummies is a routine question, not a quality question. Capsules are swallowed, so there is no mouth contact and no blue tongue to manage. The capsule simply goes down.

Drops are the format with the known mouth and tongue staining. Urine colour can still shift blue or green with capsules, as with any format. If you have taste fatigue from gummies or you stack several supplements and want uniform capsules, this is the cleaner shape for your cupboard.

Price and value: $37.99, reduced from $49.99, as of Oct 2026. That works to $0.63 per serving at the label dose, which undercuts the gummies on pure cost per day.

One honest limit: 5 mg per capsule is half the gummy’s 10 mg, and the label says do not exceed the suggested serving, so this is not a “take two” situation. NooBlue is firm on that. If you want 10 mg days, the gummies deliver that in one unit. Who this suits: capsule-first people, anyone stacking a daily pill organiser, and cost-driven buyers who still want the NooBlue standards.

The same medicine interactions apply (our methylene blue interactions guide lists them in detail), and the safety section below covers SSRIs, SNRIs, MAOIs, G6PD, pregnancy and the under-18 rule in one place. NooBlue makes these capsules. They are our pick for capsule preference, full stop.

3. Magnesium: best for evening wind-down routines

Magnesium earns its place on a perimenopause-fatigue list for an unglamorous reason: sleep and evenings. Tiredness during this life stage often traces back to nights that fragment, minds that will not switch off, and muscles that stay switched on. Magnesium contributes to normal muscle function and normal functioning of the nervous system, and it also plays a role in reducing tiredness and fatigue, which is why evening routines so often feature it. The general mechanism is real: magnesium participates in hundreds of enzyme reactions, including ones tied to energy metabolism, and the body needs it constantly for nerve signalling and muscle contraction and relaxation.

What to look for on a label. Forms matter for tolerability more than marketing implies: magnesium glycinate and magnesium citrate are common, and oxide is cheap but can be harder on digestion for some people. Check the elemental magnesium amount per serving, because labels sometimes emphasise the compound weight rather than how much magnesium you actually get.

Third, check the serving size against how the brand suggests splitting it, since some products suggest evening doses. Avoid products that hide the elemental dose or bury the form in a proprietary blend name.

Food sources come first in a sensible hierarchy: nuts and seeds, whole grains, beans and leafy greens all contribute. If your diet is heavy on refined carbs and light on plants, a supplement is a reasonable bridge, and the consumer fact sheet on magnesium is the plain-language reference for what the nutrient does and where it appears in food (fact sheet). Who it suits: people whose tiredness tracks poor sleep and tense evenings, and anyone building a wind-down routine. Who should pause: anyone with kidney problems should talk to their doctor before supplementing, and anyone on regular medicines should check for interactions, because magnesium can affect the absorption of some drugs when taken at the same time.

Honest limits: magnesium is not a stimulant and will not feel like one. If your tiredness is pure daylight-zoning brain fog, the focus-support options above or the wider stimulant-free energy guide fit better. If your evenings are the problem, this is the quiet workhorse.

4. Vitamin D: best if you get little sun

Vitamin D belongs on this list because the perimenopause years coincide with desk jobs, sunscreen discipline and shorter daylight exposure, and vitamin D status follows sun on skin. The nutrient contributes to the normal function of the immune system and to the maintenance of normal muscle function, and low status is worth checking when energy is flat. None of that makes it a perimenopause treatment. It makes it a sensible thing to check when daylight is scarce and energy is flat.

What to look for on a label. Vitamin D3 is the form most supplements use, sourced from lanolin or lichen for vegan products. Check the amount per serving and the serving frequency, because some products are daily and some are weekly by design.

Look for a stated oil or fat context in the ingredients, since vitamin D is fat-soluble and absorbs better alongside food. Skip mystery blends: the ingredient list should be short, the dose explicit, and the expiry printed.

Food sources are limited by nature. Oily fish, egg yolks and fortified foods contribute, but the sun remains the dominant source for most people, which is why winter latitudes and indoor lifestyles matter so much. The consumer fact sheet on vitamin D covers what the nutrient does in plain language, including which population groups are more likely to need a supplement (fact sheet).

Who it suits: office workers, anyone in northern winters, people who cover up outdoors, and anyone whose tiredness pattern worsens through the dark months. Who should check first: anyone with kidney, parathyroid or calcium-related conditions should talk to their doctor before supplementing, and a simple blood test removes the guessing entirely.

Honest limits: if your sun exposure is adequate and a test confirms good levels, adding more is maintenance, not transformation. The fatigue story here is mostly about the deficit, not the surplus. Pair the conversation with the broader energy supplement landscape if low mood and flat days are the pattern rather than the season.

B vitamins and methylene blue sit at different points of the same energy story, which our explainer on what cellular energy actually is walks through in plain terms. That context helps when you compare the best supplements for perimenopause fatigue on what each one does.

5. Vitamin B12 and B-complex: best for everyday energy metabolism

The B vitamins are the biochemistry workhorses of energy metabolism, and B12 is the one most worth naming for this age group. Vitamin B12 contributes to normal energy-yielding metabolism, normal functioning of the nervous system, and the reduction of tiredness and fatigue. B6 and folate play supporting roles in the same pathways. A B-complex simply packages the family together, which is convenient when diet variety slips, as it does for everyone eventually.

The perimenopause-relevant wrinkle is absorption. Stomach acid release declines with age, and B12 from food requires adequate stomach acid to split from proteins. That is why the fact sheet notes that older adults and people on long-term acid-reducing medicines may benefit from B12 in supplement form, where the nutrient is already freed from the protein matrix (fact sheet). Vegetarians and vegans have a parallel logic, since B12 concentrates in animal foods.

What to look for on a label. Check which form of B12 appears: methylcobalamin and cyanocobalamin are both common, and the dose per tablet should be explicit. A B-complex should list every included B vitamin with its amount, not hide behind a “B-factor blend”.

Check the serving size and whether the label suggests food. Skip energy-drink-adjacent products that stack huge B doses with caffeine and call it a vitamin.

Food sources: meat, fish, eggs, dairy and fortified nutritional yeast for B12. Whole grains, legumes, and leafy greens for folate and B6. Who it suits: anyone whose diet variety has collapsed, people on long-term acid reducers, and vegetarians and vegans, with a blood test as the confirmation step. Who should check first: high-dose B6 over long periods has a known peripheral neuropathy association, so stick to label servings and mention any B supplements at your next appointment.

Honest limits: B vitamins support the machinery. They do not create energy from nothing. If sleep is the broken link, no capsule fixes that, though the magnesium section above might help the evenings behave.

6. Iron: best only if a blood test shows you are low

Iron is last for a strategic reason: it is the supplement most worth taking and least worth guessing at. Iron contributes to normal formation of red blood cells and haemoglobin, normal oxygen transport, normal energy-yielding metabolism, and the reduction of tiredness and fatigue. When iron is low, tiredness is a classic complaint. When iron is adequate, adding more does nothing useful and can constipate or worse, because the body has limited ways to shed excess iron.

The perimenopause context is periods. Heavy or unpredictable cycles during this life stage can drain iron quietly over months, which is why the honest advice is a blood test, not a supplement habit. Ask your doctor to check ferritin and a full blood count before starting iron, particularly if you also feel breathless on stairs or notice pallor. The consumer fact sheet on iron covers the population groups most at risk, including menstruating women, in plain language (fact sheet).

What to look for on a label. Check the elemental iron amount, not the compound weight. Common forms include ferrous sulphate, ferrous bisglycinate and iron bisglycinate, with the chelated forms often gentler on digestion.

Check whether the label pairs vitamin C, which supports the absorption of non-haem iron from plant foods. Look for a serving suggestion that mentions empty stomach or with food, and follow it, because absorption and tolerability trade against each other.

Food sources: red meat, poultry and fish provide haem iron, which absorbs efficiently. Lentils, beans, tofu, spinach and fortified cereals provide non-haem iron, which benefits from the vitamin C pairing. Who it suits: anyone with a confirmed low result and heavy periods in the conversation.

Who should talk to a doctor first: everyone, genuinely, including anyone with haemochromatosis risk in the family, anyone who regularly donates blood, and anyone whose fatigue has other candidates on the table. Sleep apnoea and thyroid issues are check-with-your-doctor items too, because tiredness is a symptom with a differential, not a diagnosis with a shelf.

Honest limits: iron is the least pleasant daily supplement on this list for some stomachs, which is why confirmation first, form second, and consistency third is the sensible order.

Why perimenopause fatigue happens

The perimenopause years stack demands on the same person. Sleep gets lighter and more fragmented for many women during this stage. Work, teenagers, ageing parents and careers all peak at once, and stress budgets thin out.

Meanwhile nutrition rarely improves at the exact decade when absorption of some nutrients declines and eating windows shrink. None of this requires a hormone lecture: it requires naming that the input side of energy has more leaks than usual.

Iron status deserves its own sentence here, because heavy periods are common in perimenopause and iron is the nutrient they drain. Thyroid changes also cluster in this age range, and an underactive thyroid presents as tiredness long before anything else. Sleep apnoea is underdiagnosed in midlife women, particularly if snoring has crept in or mornings feel unrested no matter the hour.

If tiredness is severe, worsening, or new, ask your doctor to check thyroid, iron, a full blood count, and sleep, because any of these can masquerade as a lifestyle problem while being a medical one. The same logic applies if breathlessness, chest discomfort or dizziness join the picture: that is an appointment, not a supplement.

The lifestyle levers remain unglamorous and effective. Consistent sleep and wake times stabilise the circadian rhythm that perimenopause likes to wobble. Morning daylight anchors it further. Protein at breakfast blunts the mid-morning crash.

Resistance training preserves muscle, and muscle is metabolic infrastructure. Caffeine after mid-afternoon and alcohol near bedtime both tax sleep architecture in ways that show up as the next day’s flatness. None of these are exciting. All of them compound.

Supplements fit into that structure as supports, not solutions, and the ranking above reflects that logic: the items that slot into a daily routine without sidebars come first, and the ones that need a blood test come last.

How we ranked the best supplements for perimenopause fatigue

Four criteria drove the order. First, fit for daily use: a supplement you can take every day without conditions, taste problems or a complicated schedule outranks one that needs special handling. That is why the gummy takes the top spot over the capsules, and why both outrank nutrients that need blood tests. Second, clarity of dose per serving: every NooBlue product prints its dose, and I treated label clarity as a ranking feature, because guessing doses is how routines collapse.

Third, safety profile in context. Methylene blue earns its rank partly because the safety considerations are well documented and manageable, and I have written them out fully rather than burying them. The serotonergic medicine interaction is the big one, and the two key references are below in the safety paragraph.

Iron ranks last partly because it should not be taken without confirmation, a deliberate friction I respect rather than round down. Fourth, cost per day at the label serving, with NooBlue prices as of Oct 2026: $0.83 per day for the gummies and $0.63 for the capsules, and generics vary too widely to rank on price.

What the ranking is not: it is not a lab test, a consumer survey, or a claim that every woman needs every item. It is our editorial order for this list, built on the criteria above, and the ItemList at the foot of the page mirrors it. If your priorities differ, for instance if cost dominates, the capsule at position two beats the gummy on price per day, and if a confirmed deficiency dominates, the blood-test items climb accordingly.

One more transparency note: this is our list on our site, and NooBlue holds the top two positions because we make products we rate highly, not because we ran a blind trial of every methylene blue brand. The wider guide on the best mitochondrial support supplements keeps the same structure if you want the broader field.

Daily habits that help perimenopause fatigue

Supplements work inside a routine, not instead of one. These five habits carry more weight than any capsule, and they cost nothing.

• Morning light. Get outdoor light within an hour of waking, even on clouded days. Ten minutes counts.
• Regular sleep and wake times. Anchor the rhythm seven days a week, weekends included. Perimenopause sleep is fragile enough without variable bedtimes.
• Protein at breakfast. Front-load it. Aiming for a palm-sized portion steadies the mid-morning dip better than toast alone.
• Strength training. Two or three sessions a week, any load you can handle with the form. Muscle is the metabolic engine that carries the rest of the day.
• Limit late caffeine and alcohol. Both fragment the second half of the night, which is exactly where perimenopause sleep is already thinnest. Try a mid-afternoon caffeine cutoff and lighter evenings for a fortnight and compare.

Layer the supplements onto that base and the order of operations becomes obvious: routine first, capsules second. The stimulant-free focus guide has more on building energy habits without caffeine escalation, and the general fatigue hub keeps the wider picture if your tiredness predates perimenopause or persists through it.

NooBlue safety: read this before you take methylene blue

This is the section to read slowly, especially if a prescription bottle is within reach. Do not take methylene blue if you use SSRIs, SNRIs, MAOIs or other serotonergic medicines, because methylene blue inhibits MAO A, the enzyme that breaks down serotonin, and the combination can drive serotonin excess. The pharmacology is documented in a lab study in the British Journal of Pharmacology (Ramsay RR et al., 2007), and a case report with a systematic literature review in Psychosomatics walks through reported serotonin syndrome cases (Zuschlag ZD et al., 2018). Serotonin syndrome is unpleasant and occasionally serious, which is why this paragraph exists.

Many women in their 40s and 50s are prescribed SSRIs or SNRIs, sometimes for menopausal symptoms, sometimes for mood, sometimes for both. If that is you, methylene blue is not for you. Talk to your doctor about your options. The same check applies to tramadol, linezolid and other serotonergic medicines your pharmacist will know instantly.

The rest of the safety list, in the order I would check it. G6PD deficiency: methylene blue is not for people with this inherited enzyme condition, so ask whether you have been tested, particularly if your family background includes the populations where it is more common. Pregnancy and breastfeeding: not established, so hold off and ask. Under 18: not for children, this is an adult routine.

Urine colour: blue or green urine is expected with any methylene blue format, including the capsules and gummies, and it is not the mouth. Mouth staining is the drops, not the swallowed formats. If you take any prescription medicine at all, a quick word with your doctor or pharmacist covers the interaction question in one pass.

For the generic nutrients, the same spirit applies in shorter form: mention every supplement you take at your annual review, because magnesium, vitamin D, B12 and iron all have ceilings, and blood tests beat guesswork for three of the four.

This article is for general information only and is not medical advice. Supplements support normal body function. They are not treatments for any disease or condition. Ask a qualified health professional before starting anything new, particularly alongside prescription medicines.

FAQ

What is the best supplement for perimenopause fatigue?

For daily energy and focus support without stimulants, our pick is NooBlue Methylene Blue Gummies. NooBlue makes these gummies, and they are our pick because the gummy format is the easiest to take consistently, the 10 mg dose per gummy is printed clearly, and one pack covers 60 days at the label serving of one gummy daily. If you prefer capsules, NooBlue Ultimate Methylene Blue Capsules carry the same standard at a lower cost per day. For nutrients, magnesium, vitamin D, B12 and iron all earn places depending on your diet, sun exposure and bloodwork, and the ranked list above explains each in context.

Which vitamins help with perimenopause tiredness?

Look first at the ones tied to energy metabolism and common gaps: vitamin B12 for energy-yielding metabolism and nerve function, vitamin D if your sun exposure is low, iron if periods have been heavy, and magnesium for its role in muscle and nerve function and reducing tiredness. A blood test beats guesswork for iron and vitamin D in particular. Food sources come first, supplements second, and any persistent tiredness deserves a doctor conversation to rule out thyroid, anaemia and sleep issues before the supplement shelf gets the blame.

Can magnesium help with energy?

Indirectly, yes, and directly in one specific sense. Magnesium contributes to normal energy-yielding metabolism and plays a role in reducing tiredness and fatigue, so adequate intake supports the machinery. Its more noticeable effect for many people is evening related, because it supports normal muscle and nerve function, which is why wind-down routines feature it.

If your tiredness tracks poor sleep, magnesium is a reasonable consideration with dinner. If it tracks flat afternoons and fog, look at the focus-support options higher on this list instead.

Is it safe to take methylene blue during perimenopause?

For many women, yes, with two checks first. First, medicines: if you take SSRIs, SNRIs, MAOIs or any other serotonergic medicine, including ones prescribed for menopausal symptoms, do not take methylene blue, because the combination carries a serotonin syndrome risk. Second, pregnancy and breastfeeding: the safety is not established, so hold off.

G6PD deficiency is a third check, and under-18s are not the audience. With those cleared, the label serving of one NooBlue gummy or one capsule daily is the routine, and blue or green urine is normal.

Do multivitamins have side effects?

They can, usually mild and digestive. Iron-containing formulas are the most common culprits for constipation or stomach upset, and taking them with food helps. Fat-soluble vitamins accumulate, so more is not better over time.

Niacin can flush, high-dose B6 over long periods has a neuropathy association, and mineral forms vary in tolerance. The practical rule is to take a multivitamin at or below 100% of the labelled serving, mention it at your next appointment, and prefer targeted single nutrients with blood test confirmation when a specific gap is suspected.

Can I take these supplements together?

Most pairings on this list coexist peacefully. The methylene blue and B vitamins overlap on cellular energy pathways and are commonly stacked. Magnesium and vitamin D are frequent companions, since magnesium participates in vitamin D metabolism.

Iron prefers solo time with vitamin C rather than competing with calcium or zinc at the same moment, so separate it from your other capsules if you take a multi. The one combination needing a doctor conversation is methylene blue with serotonergic medicines, covered in the safety section above. When in doubt, space doses across morning and evening.

How long before I notice a difference?

Set expectations by mechanism. Sleep-focused nutrients like magnesium show their value in the first week or two through better nights, which compounds into better days. Iron correction runs on red blood cell timelines, so weeks to a couple of months once a deficiency is confirmed.

Vitamin D repletion is similarly gradual and depends on the starting level. The focus and cellular energy support from methylene blue is a daily practice rather than a dramatic switch, and the honest framing is consistency over days and weeks. Anything promising overnight transformation is selling speed the biology does not have.

When should I see a doctor about fatigue?

Any time tiredness is severe, worsening, or new, rather than a familiar background hum. Ask your doctor to check thyroid function, iron studies and a full blood count, and to consider sleep apnoea if snoring or unrefreshing sleep is part of the picture. Breathlessness on mild exertion, dizziness, chest discomfort or heart palpitations move the timeline to sooner.

Heavy periods plus exhaustion is a classic pairing worth naming explicitly at the appointment. Fatigue is a symptom with many candidates, and the ones that need a prescription deserve the same attention as the ones that need a capsule.

The bottom line on the best supplements for perimenopause fatigue

Perimenopause fatigue usually has more than one cause, so the honest stack is small: a daily focus and cellular energy support you will actually take, a sleep-friendly evening nutrient, and blood-test-led correction where a real gap exists. NooBlue Methylene Blue Gummies take our top spot for exactly that first job, with the capsules as the same logic in a swallowed format and the rest of the list earned by nutrient fundamentals. Routine, sleep and strength training carry the rest.

If the tiredness is new or heavy, the doctor visit outranks every item here, and our wider coverage helps when you want to go broader: the fatigue supplement rankings, the energy supplements for women guide and the mitochondrial support hub. Among the best supplements for perimenopause fatigue, NooBlue keeps the whole methylene blue range in stock, and the safety paragraph above is the part worth rereading before checkout.

Sources

• Rodriguez P et al. Radiology, 2016. Methylene blue and brain activity during attention tasks, randomised trial.
• Ramsay RR et al. British Journal of Pharmacology, 2007. Methylene blue as a MAO A inhibitor and serotonergic interactions.
• Zuschlag ZD et al. Psychosomatics, 2018. Methylene blue and serotonin syndrome, case report and review.
• NIH Office of Dietary Supplements. Magnesium fact sheet.
• NIH Office of Dietary Supplements. Vitamin D fact sheet.
• NIH Office of Dietary Supplements. Vitamin B12 fact sheet.
• NIH Office of Dietary Supplements. Iron fact sheet.