A combination of 2 label ingredients.
Supports hemoglobin production and oxygen transport; extra iron does not automatically improve energy when iron status is adequate.
Supports the maintenance of normal bones and teeth, muscle function and nerve signaling.
Calcium
18 mgTrace amount — not scored
Polysorbate 80Emulsifier
Chassaing et al. 2015 (Nature, PMID 25731162) tested polysorbate 80 directly and showed it thinned the gut mucus barrier, altered microbiota composition, and induced low-grade inflammation and metabolic syndrome in mice. The strongest human evidence is for a related emulsifier rather than polysorbate 80 itself: Chassaing 2022 (Gastroenterology, PMID 34774538) was a controlled human feeding RCT of carboxymethylcellulose (CMC) that found microbial encroachment into the mucus layer — polysorbate 80 has not been tested in an equivalent human trial. In vitro work (e.g. Roberts 2010) shows polysorbate 80 enhances bacterial translocation across intestinal epithelium, and observational data link overall dietary-emulsifier exposure to IBD risk. EFSA is mid re-evaluation of polysorbates (E432–E436). For a supplement excipient with purely cosmetic function (improving the look/texture of soft gels and liquids), the gut-barrier risk profile is unfavorable when safer alternatives (sunflower lecithin, MCT carriers, gum acacia) are widely available.
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
Polyethylene Glycol (Coating)Coating
A polyether polymer used as a tablet coating and plasticizer
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Croscarmellose SodiumDisintegrant
Cross-linked cellulose derivative used as a superdisintegrant
HypromelloseCapsule
Plant-derived capsule material from cellulose
Triethyl CitrateCoating
A citric acid ester used as a plasticizer in film and enteric coatings
On the label
Suggested use: Adults, for iron deficiency, take one tablet daily. For easier swallowing, take with water before and during ingestion. Taking with a meal may minimize the possibility of stomach upset.
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What 138 iron supplements cost

Natural Factors
Iron Chelate 25 mg
⚡ for Energy

21st Century
Slow Release Iron
⚡ for Energy

Bob's Red Mill
Organic Whole Flaxseed, 13 oz (368 g)
💧 for Hydration

Bob's Red Mill
Premium Whole Flaxseed, 13 oz (368 g)
💧 for Hydration

Arrowhead Mills
Organic Flax Seeds, Gluten Free, 1 lb (453 g)
💧 for Hydration
Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.
Not medical advice. Consult your healthcare professional.