Home › Best Supplements › What is the best iron supplement for hair loss?
RankingsWhat is the best iron supplement for hair loss?
We may earn a commission when you buy through links on this page. No brand pays to be ranked. How we rank products
If your hair is thinning and your energy has dropped, low iron could be part of the picture. Iron deficiency is one of the most common nutritional shortfalls worldwide, and research links it to a type of hair shedding called telogen effluvium. The trouble is that not every iron supplement is the same: some forms absorb better, some are gentler on the stomach, and some include cofactors that help the iron do its job.
Our editorial team compared six widely available iron supplements on the US market, scoring each on dose and absorption, tolerance, value and buyer feedback. Below, we explain the science behind iron and hair loss, walk you through what to look for, and review every product in detail so you can make a confident choice.
A well-absorbed bisglycinate with vitamin C gives most people the best chance of rebuilding iron stores and reducing hair shedding.
Our top pick is Pure Encapsulations – OptiFerin-C, which pairs 28 mg of iron bisglycinate with 100 mg of vitamin C for better absorption. If you prefer a no-frills capsule, Thorne – Iron Bisglycinate is the gentlest option we found.
How does iron affect your hair?
Iron is essential for making hemoglobin, the protein in red blood cells that carries oxygen to every tissue, including hair follicles. When iron stores drop, the body prioritizes vital organs over hair growth. Follicles can shift prematurely into their resting phase, a process researchers call telogen effluvium, which leads to diffuse thinning and increased shedding across the scalp rather than patchy bald spots.
A 2009 study published in Acta Dermatovenerologica Croatica found that women with diffuse telogen hair loss had significantly lower serum ferritin than controls (Moeinvaziri et al., 2009). Ferritin is the protein that stores iron; it drops before hemoglobin does, which means your hair can start thinning even if a standard blood count looks normal. A 2019 review in Dermatology and Therapy confirmed that iron deficiency is among the most common nutritional causes of hair loss in both men and women (Almohanna et al., 2019).
The good news is that iron-related hair shedding is usually reversible. Once stores are replenished, most people notice less shedding within a few weeks and visible regrowth over the following months. But supplementing only makes sense if your levels are actually low, so a blood test is the essential first step.
How much iron do you actually need?
The Recommended Dietary Allowance (RDA) set by the National Institutes of Health depends on age and sex. Adult men and women over 50 need 8 mg a day. Women aged 19 to 50 need 18 mg, largely because of menstrual losses. During pregnancy the figure rises to 27 mg (NIH Office of Dietary Supplements).
The Tolerable Upper Intake Level for adults is 45 mg a day from food and supplements combined. A doctor may prescribe a higher dose for a limited time to correct a confirmed deficiency, but self-prescribing large amounts carries real risks, from stomach pain to iron overload.
If hair loss is your concern, the number to watch is ferritin, not just hemoglobin. Some dermatologists suggest that ferritin below roughly 30 ng/mL may be associated with increased shedding, and that levels above 70 ng/mL are where most people see improvement (Park et al., 2013). Ask your doctor for a full iron panel that includes ferritin, serum iron and transferrin saturation.
Hemoglobin tells you whether you are anemic right now. Ferritin tells you how much iron you have in reserve. Your ferritin can drop well before hemoglobin falls, which is why hair shedding sometimes starts before anemia shows up on a routine blood test.
Four ways to get more from your iron supplement
1. Pair iron with vitamin C
Vitamin C converts non-heme iron into a form the gut absorbs more readily. Taking your supplement with a small glass of orange juice or choosing a formula that already contains vitamin C can make a meaningful difference to how much iron actually reaches your bloodstream.
2. Separate iron from tea, coffee and calcium
Tannins in tea and coffee, and calcium from dairy or supplements, can reduce iron absorption by up to 60 %. Leave at least two hours between your iron dose and these foods or drinks for the best results.
3. Consider alternate-day dosing
A 2017 trial in The Lancet Haematology found that taking iron on alternate days led to higher fractional absorption than taking it every day, likely because daily dosing triggers a spike in hepcidin, a hormone that blocks iron uptake (Stoffel et al., 2017). If your doctor agrees, an every-other-day schedule may help you absorb more with fewer side effects.
4. Get a follow-up blood test
Recheck your ferritin after eight to twelve weeks. If levels have not risen, your doctor may adjust the dose, switch the form, or investigate other causes of poor absorption such as celiac disease.
Take iron first thing in the morning on an empty stomach if you can tolerate it. If it upsets your stomach, take it with a small, vitamin-C-rich snack such as strawberries or bell pepper.
How we scored these six supplements
We evaluated each product on four criteria, weighted to reflect what matters most when you are trying to rebuild iron stores: Dose and absorption (35 %) covers elemental iron per serving, form bioavailability and whether cofactors such as vitamin C are included. Tolerance (25 %) considers the likelihood of stomach upset based on the iron form and dose. Value (20 %) looks at cost per serving and pack size. Buyer feedback (20 %) draws on verified reviews across major US retailers. Full methodology: how we rank products.
Scores are strictly ranked from first to last. Each sub-score reflects a verifiable fact in the review below.
Six iron supplements for hair loss, compared
| Rank | Product | Form & dose | Score | |
|---|---|---|---|---|
| #1Best overall | Pure Encapsulations - OptiFerin-C | Iron bisglycinate capsule 28 mg + 100 mg vitamin C | 8.8/10 | Check price |
| #2Gentlest formula | Thorne - Iron Bisglycinate | Iron bisglycinate capsule 25 mg elemental iron | 8.5/10 | Check price |
| #3Best multi-nutrient | MegaFood - Blood Builder | Ferrous bisglycinate tablet 26 mg + folate, B12, beet root | 8.2/10 | Check price |
| #4Best value | Solgar - Gentle Iron | Iron bisglycinate chelate capsule 25 mg elemental iron | 7.9/10 | Check price |
| #5Best whole food | Garden of Life - Vitamin Code Raw Iron | Brown rice chelate capsule 22 mg + folate, B12, vitamin C | 7.5/10 | Check price |
| #6Best liquid | Floradix - Iron + Herbs | Ferrous gluconate liquid 10 mg per 10 mL + B vitamins | 7.2/10 | Check price |
Pure Encapsulations - OptiFerin-C
High-dose bisglycinate paired with 100 mg of vitamin C for superior absorption in a single capsule.
- Iron28 mg per capsule (iron bisglycinate)
- Vitamin C100 mg (calcium ascorbate blend)
- Capsulevegetarian
- Pack60 capsules (2-month supply)
- you want iron and vitamin C in one capsule
- you need a higher dose to rebuild stores quickly
- your doctor prescribed a different iron form
- you prefer a lower dose
OptiFerin-C stands out because it combines 28 mg of iron bisglycinate with 100 mg of vitamin C in the same capsule. Bisglycinate is one of the gentlest and best-absorbed forms of supplemental iron, and the added vitamin C boosts uptake further. The formula is free from common allergens, artificial additives and unnecessary fillers, which is typical of Pure Encapsulations' approach.
Buyers on iHerb give it consistently high marks for stomach comfort. "This iron is more gentle on the stomach," writes Nikol on iHerb. At 60 capsules per bottle, you get a two-month supply if you dose daily, or four months on an alternate-day schedule. The higher iron content per capsule means faster ferritin recovery for people whose stores are genuinely depleted.
Thorne - Iron Bisglycinate
A clean, minimal-ingredient capsule using Ferrochel chelated iron for excellent tolerance.
- Iron25 mg per capsule (iron bisglycinate)
- Otherhypromellose capsule, L-leucine, cellulose
- Capsulevegetarian
- Pack60 capsules
- stomach comfort is your top priority
- you want a trusted, third-party tested brand
- you also need vitamin C or B12 in the same capsule
- you prefer a whole-food formula
Thorne uses Ferrochel iron bisglycinate, a patented chelated form known for high bioavailability and low gastrointestinal side effects. The ingredient list is refreshingly short: iron, a vegetarian capsule and two inactive excipients. No vitamin C is included, so you will want to take it with a food source of vitamin C or a separate supplement.
Thorne's manufacturing is NSF Certified for Sport, which means every batch is independently tested for purity and label accuracy. Buyers on Walmart praise the gentle formula: "No stomach issues at all," reports Lisa. The 25 mg dose sits comfortably within the RDA for most women and well below the 45 mg upper limit, making it a solid daily option that is unlikely to cause overload.
Where to buy
Prices change often, so we don't show them here: check the retailer for today's price.
MegaFood - Blood Builder
Iron plus folate, B12 and beet root in one tablet designed to support red blood cell production.
- Iron26 mg per tablet (ferrous bisglycinate, FoodState)
- Folate680 mcg DFE
- Vitamin B1212.5 mcg
- Alsobeet root, vitamin C, organic orange
- Pack60 tablets
- you want iron with B-vitamin cofactors in one tablet
- you are rebuilding stores and want a multi-nutrient approach
- you prefer a capsule you can open
- you want a single-ingredient formula
Blood Builder takes a broader approach by bundling 26 mg of iron with folate, vitamin B12, beet root and vitamin C. Folate and B12 both play roles in red blood cell formation, and beet root provides dietary nitrates. MegaFood uses a proprietary FoodState process that embeds the nutrients in a whole-food matrix for gentler digestion.
The tablet format is larger than a standard capsule, which some buyers mention as a drawback. On the plus side, verified reviewers on Amazon frequently note improved energy and good stomach tolerance. "Easy on the stomach and my levels came up fast," writes R. on Amazon. If you want one product to cover iron and its key cofactors, Blood Builder is a practical choice.
Where to buy
Prices change often, so we don't show them here: check the retailer for today's price.
Solgar - Gentle Iron
A vegan bisglycinate capsule in a 180-count bottle that keeps the cost per serving low.
- Iron25 mg per capsule (iron bisglycinate chelate)
- Capsulevegetable cellulose
- Suitable forvegans
- Certificationsnon-GMO, gluten-free, kosher
- Pack180 capsules (6-month supply)
- you want a large bottle that lasts for months
- you follow a vegan diet and need certified vegan iron
- you want added vitamin C or B vitamins
- you prefer a smaller, travel-friendly bottle
Solgar Gentle Iron delivers 25 mg of iron bisglycinate chelate in a vegan capsule, and the 180-count bottle makes it one of the most economical options on this list. The formula is free from gluten, wheat, dairy, soy and artificial preservatives.
Buyer reviews are generally positive for tolerance, though a few report that the capsules have a faint metallic aftertaste. There is no added vitamin C, so pairing it with a vitamin-C-rich food at the time of dosing will help absorption. For anyone who needs a long-term, budget-friendly bisglycinate, Solgar is hard to beat on value.
Where to buy
Prices change often, so we don't show them here: check the retailer for today's price.
Garden of Life - Vitamin Code Raw Iron
USDA Organic iron with folate, B12, vitamin C and a probiotic blend in a whole-food capsule.
- Iron22 mg per capsule (brown rice chelate)
- Vitamin C25 mg
- Folate400 mcg
- Vitamin B12500 mcg
- Alsoprobiotic blend (500 million CFU)
- Pack30 capsules
- you prioritize organic and whole-food sourcing
- you want probiotics alongside your iron
- you need more than 30 days per bottle
- you prefer a well-studied iron form like bisglycinate
Vitamin Code Raw Iron uses 22 mg of iron from a brown rice chelate, paired with vitamin C, folate, B12 and a probiotic and enzyme blend. The entire formula carries USDA Organic certification, which appeals to buyers who prefer food-based supplements. The capsule is vegan and can be opened and mixed into liquid.
The main drawback is the 30-capsule bottle, which lasts only a month at a daily dose. The iron form (brown rice chelate) is also less studied than bisglycinate, so there is less published data on its absorption rate. Buyers on Amazon generally report good tolerance, though a few note a grassy taste if the capsule is opened.
Where to buy
Prices change often, so we don't show them here: check the retailer for today's price.
Floradix - Iron + Herbs
A liquid iron tonic with B vitamins and herbal extracts for people who cannot swallow tablets or capsules.
- Iron10 mg per 10 mL (ferrous gluconate)
- Thiamin (B1)2.3 mg
- Riboflavin (B2)3.6 mg
- Vitamin B61.8 mg
- Vitamin B126.8 mcg
- Alsoherbal extracts (nettle, fennel, carrot, spinach)
- Serving10 mL twice daily
- you struggle to swallow capsules or tablets
- you want a gentler, lower dose of iron
- you need a higher dose to correct a significant deficiency
- you dislike the taste of liquid supplements
Floradix is a liquid iron tonic that combines 10 mg of ferrous gluconate per serving with B vitamins and herbal extracts including nettle, fennel and spinach. The liquid format absorbs quickly and avoids the swallowing issue that puts some people off tablets. The taste is fruity and mildly herbal, and most buyers tolerate it well.
The trade-off is the lower iron dose: at 10 mg per serving, it may not be enough for someone whose ferritin is seriously depleted. Floradix also needs refrigeration after opening and has a shorter shelf life than capsules. "Great taste and no stomach issues," writes Annie on Walmart, though several reviewers note the bottle runs out faster than expected.
Where to buy
Prices change often, so we don't show them here: check the retailer for today's price.
Who should not take iron without medical advice
You have hemochromatosis or another iron-storage disorder. You take blood thinners, thyroid medication or certain antibiotics. You are pregnant or breastfeeding. You have a history of stomach ulcers or inflammatory bowel disease. Iron supplements can be dangerous for young children: keep them out of reach at all times.
Iron is not a nutrient you should supplement without knowing your levels. Taking iron when your stores are already adequate does not speed up hair growth and can lead to iron overload, which may damage the liver, heart and pancreas. The NIH sets the tolerable upper limit at 45 mg a day for adults from food and supplements combined, and higher doses should only be taken under medical supervision.
If your hair is thinning but your iron and ferritin are normal, the cause may lie elsewhere: thyroid disorders, hormonal changes, stress, autoimmune conditions or androgenetic alopecia all cause hair loss that iron supplements will not fix. A dermatologist or your primary care provider can help pinpoint the right diagnosis.
Frequently asked questions
How long does it take for iron supplements to help hair loss?
Most people notice reduced shedding within four to eight weeks of starting iron, but visible regrowth usually takes three to six months of consistent supplementation. Hair grows roughly half an inch per month, so patience is essential. A follow-up ferritin test after eight to twelve weeks helps confirm that stores are rising (Trost et al., 2006).
Can too much iron cause hair loss?
Yes. Iron overload (hemochromatosis or over-supplementation) can damage organs and, paradoxically, contribute to hair thinning. Never take iron supplements unless a blood test confirms your levels are low. The tolerable upper limit is 45 mg a day for adults (NIH).
Should I take iron on an empty stomach?
An empty stomach improves absorption, but many people find it causes nausea or cramping. If that happens, take your supplement with a small, vitamin-C-rich snack such as an orange or a handful of strawberries. Avoid taking it with tea, coffee or calcium-rich foods.
What ferritin level is linked to hair loss?
Several studies associate ferritin below roughly 30 ng/mL with increased shedding. Some dermatologists suggest aiming for levels above 70 ng/mL for optimal hair growth, though no universal cutoff has been established (Kantor et al., 2003).
Can I take iron with biotin for hair growth?
There is no known interaction between iron and biotin, so they can be taken together. However, biotin's effect on hair growth in people who are not biotin-deficient is not well supported by evidence. Focus on correcting any confirmed iron deficiency first.
The bottom line
If a blood test confirms that your iron stores are low, the right supplement can help reduce shedding and support regrowth over the following months. Look for a well-absorbed form such as iron bisglycinate, pair it with vitamin C, and recheck your ferritin after eight to twelve weeks. No supplement replaces a diagnosis: if your iron is normal and your hair is still thinning, see a dermatologist.
Of the six products we reviewed, Pure Encapsulations OptiFerin-C earns the top spot for combining a high bisglycinate dose with built-in vitamin C, all in a gentle, hypoallergenic capsule.
Pure Encapsulations - OptiFerin-C
- 28 mg iron bisglycinate per capsule
- 100 mg vitamin C for enhanced absorption
- Hypoallergenic, no common allergens
Independent guides to natural remedies and supplements, checked against NHS and EFSA references.