Best Iron Bisglycinate Supplements 2026: Cost per Effective Dose
Top pick for Iron Bisglycinate: Thorne Iron Bisglycinate 25 mg — 25mg per 1 capsule, NSF Certified for Sport, $0.27/day. Our quality pick.
Registry check · Iron Bisglycinate
Does anyone independently verify Iron Bisglycinate supplements?
1 of these 4 products are confirmed in NSF/ANSI 173, which puts this category in the minority with any verified option at all. The other 3 are not listed anywhere we can check — not evidence against them, only an absence of independent confirmation.
This is one of the 8 long-established nutrients where verified options exist, unlike newer arrivals such as NMN or lion’s mane, where 14 of 17 categories have none. If you want a certified Iron Bisglycinate product, you can actually buy one.
Certification is not a dosing guarantee. Across the whole catalogue, certified products reach the clinically studied dose 57% of the time and uncertified ones 71% — a gap too small to mean anything (Fisher p = 0.185). Read the Iron Bisglycinate dose column either way.
4 checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What 3 Iron Bisglycinate labels show
Priced per day, these iron bisglycinate products run $0.10 to $0.32 — a 3.2× gap between the cheapest and dearest iron bisglycinate here, across 3 brands.
Servings here are close enough to compare directly, so the gap is a real one: NOW Foods at $0.10 buys the same thing as MegaFood at $0.32.
All Iron Bisglycinate Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| NOW Foods Iron 36 mg Double Strength (Ferrochel) | NOW Foods | 36mg / 1 capsule | $0.10 | None | Budget Pick | Buy |
| Thorne Iron Bisglycinate 25 mg | Thorne | 25mg / 1 capsule | $0.27 | NSF Certified for Sport | Quality Pick | Buy |
| MegaFood Blood Builder | MegaFood | 26mg / 1 tablet | $0.32 | NSF Certified | Buy |
In-Depth Iron Bisglycinate Guides
Go deeper on iron bisglycinate — by goal, by form, and what the evidence actually supports:
Our Picks
Quality Pick: Thorne Iron Bisglycinate 25 mg
25mg per 1 capsule. NSF Certified for Sport. $0.27/day. 60 servings per container at $16.00.
Budget Pick: NOW Foods Iron 36 mg Double Strength (Ferrochel)
36mg per 1 capsule. $0.10/day. 90 servings per container at $9.55.
Dose check · Iron Bisglycinate
1 of these 4 cannot be taken at the studied Iron dose
One product on this page delivers more than 27 mg in a single capsule — NOW Foods Iron 36 mg Double Strength (Ferrochel) — and a capsule cannot be halved, so there is no way to take it at the studied amount. That is not an argument against buying Iron Bisglycinate; it is the reason the cheapest row per milligram is not automatically the one to click.
The label trap on Iron Bisglycinate:a 325mg ferrous sulfate tablet is only ~65mg elemental (~20%); gluconate ~12%, fumarate ~33% — read the elemental-iron line not tablet weight
Method: studied range from our own Iron Bisglycinate dosage guide (PMID 29032957), priced against the 4 products above — capsules in whole servings, powders in fractions. Trial doses, not a prescription.
The shelf · Iron Bisglycinate
The Iron Bisglycinate shelf is unusually consistent
Across 4 products from 4brands, the cheapest day is NOW Foods Iron 36 mg Double Strength (Ferrochel) at 10¢ and the dearest MegaFood Blood Builder at 32¢ — a gap of 3.2×, where categories on this site routinely run 15× or worse. With Iron Bisglycinate priced this tightly, the 4-brand question of who will verify their contents decides more than the price column does.
Method: the 4 Iron Bisglycinate products above, compared on label facts — serving size, servings per container, form, price. Not a dosing recommendation.
The evidence · Iron Bisglycinate
What the published reviews of Iron Bisglycinate concluded
- Effects of iron supplementation on cognitive development in school-age children: Systematic review and meta-analysis. · PloS one, 2023
“Iron supplementation has a significant positive effect on the intelligence, attention and concentration, and the memory of school-age children but there was no evidence on the effect of iron supplementation on their school achievement.”
- Optimal dose and duration of iron supplementation for treating iron deficiency anaemia in children and adolescents: A systematic review and meta-analysis. · PloS one, 2025
“Low-dose iron supplementation (<5 mg/kg/day) combined with treatment durations of either less than 3 months or more than 6 months, is optimal for improving Hb levels in children and adolescents with IDA.”
- Daily oral iron supplementation during pregnancy. · The Cochrane database of systematic reviews, 2024
“Daily oral iron supplementation during pregnancy may reduce maternal anaemia and iron deficiency at term. For other maternal and infant outcomes, there was little to no difference between groups or the evidence was uncertain.”
- Oral iron supplementation and anaemia in children according to schedule, duration, dose and cosupplementation: a systematic review and meta-analysis of 129 randomised trials. · BMJ global health, 2023
“Weekly and shorter duration iron supplementation at moderate or high doses might be optimal approaches for children and adolescents at risk of deficiency.”
Method: PubMed searched in humans for systematic reviews and meta-analyses with Iron Bisglycinate in the title; these 4 of the 38 that qualified are shown with the authors’ own conclusion quoted rather than summarised. What it cannot tell you: whether Iron Bisglycinate will work for you — each of these reports an average across trials published 2023–2025, and null findings are shown here as readily as positive ones.
How these 3 Iron Bisglycinate products were ranked
1 of these 3 are confirmed in a certifier's registry — the only iron bisglycinate rows where the claim is independently backed — and the rest are ranked on cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever iron bisglycinate you buy. Full methodology.