Products · Vitamins & minerals · Thorne
Thorne Iron Bisglycinate 25 mg
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A single-ingredient iron bisglycinate capsule (25 mg) listed in NSF’s Certified for Sport database. Iron is for confirmed low iron only, because excess is hard to excrete and a child’s overdose can be fatal.
Best for People with a confirmed low iron level, after testing and a clinician’s advice, who want the glycine-bound form that our guide describes as gentler on the stomach than ferrous sulfate.
- Our quality rating
- Good (4 of 5)
- Price range
- Budget
- Verified marks
- NSF Certified for Sport (capsules, 60 count)
- Size
- 60 capsules (60 servings at one a day)
approx. $16 for 60 capsules
See it on Thorne’s site →We are not affiliated with Thorne. This link goes to the maker’s own page, with no tracking code. How we're funded.
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How we evaluated it
Why we chose it What put it on our list
- NSF’s Certified for Sport database lists “Thorne Iron Bisglycinate”: capsules, package size 60, one capsule a serving, with a long list of lots (more than 25 shown, starting 416477).
- The label has one active ingredient with an amount: iron as bisglycinate, 25 mg. The other ingredients are leucine, microcrystalline cellulose, silicon dioxide and the hypromellose capsule.
- Our iron guide says ferrous bisglycinate raised hemoglobin as well as ferrous sulfate with fewer stomach side effects.
- At $16 for 60 capsules it costs about $0.27 a day.
Trade-offs What to weigh before you buy
- Test before you take it. Our iron guide says to check ferritin and hemoglobin first, because excess iron is hard to excrete and hemochromatosis damages the liver, heart and pancreas.
- Thorne’s warning: accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under six. Keep it out of reach.
- Iron absorption falls with calcium, tea and coffee, and iron can interfere with thyroid medicine. See our timing guide.
- No batch certificate is public. NSF’s listing shows lot numbers, not results, and Thorne’s page, which names NSF Certified for Sport, shows none.
What to know Details worth knowing first
Iron is the supplement where testing first matters most. Our iron guide says oral iron probably corrects a confirmed deficiency, and warns that excess iron is hard to excrete. So this is a product for people who have been told they are low, not a daily default.
If you are in that group, this capsule is a plain choice: 25 mg of iron as bisglycinate and nothing else active, with NSF’s Certified for Sport database listing the product and a long run of lots. Our guide says this form raised hemoglobin as well as ferrous sulfate with fewer stomach side effects.
Take it as your clinician directs, away from calcium, tea and coffee (see do supplements interfere with each other), and keep it where children cannot reach it. For what a seal can and cannot show, see how to tell if a supplement is pure.
Quality & testing How it measures up against our checklist
- Third-party tested
- Yes
- Tested by
- NSF (Certified for Sport)
- Certificate of analysis
- No
| What we checked | What we found |
|---|---|
| Third-party tested Verified | Listed in NSF’s Certified for Sport database as “Thorne Iron Bisglycinate”: capsules, 60 count, more than 25 lots, gluten-free claim. The listing shows no certification date or status. |
| A certificate of analysis Not verified | None on Thorne’s page. NSF’s listing shows lot numbers but no results. |
| The right form Maker’s claim | Iron as bisglycinate, 25 mg of iron per capsule. |
| A plain label Maker’s claim | One active ingredient with an amount. No proprietary blend. |
| Disclosed extras Maker’s claim | Leucine, microcrystalline cellulose, silicon dioxide, hypromellose (capsule). Thorne lists it as gluten-free, dairy-free and soy-free. |
| Safety warning Maker’s claim | Thorne’s page warns that accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under six. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
Alternatives Other options to compare
- Get iron from food first Our iron guide covers plant iron with vitamin C and what blocks absorption.
- Nature Made Iron 65 mg tablets (ferrous sulfate) About $11 for 180 on Nature Made’s site, where the page says USP has tested and verified it; we could not open USP’s database, and sulfate is the form our guide says can upset the stomach.