Iron Bisglycinate

What Is Iron Bisglycinate?

Thorne Iron Bisglycinate provides 25mg of iron in the chelated bisglycinate form — one of the most bioavailable and gentlest forms of iron supplementation available. Unlike ferrous sulfate, the most common form found in conventional iron supplements, bisglycinate iron is bound to the amino acid glycine, which enhances absorption while dramatically reducing the gastrointestinal side effects like constipation, nausea, and stomach upset that cause many people to discontinue iron supplementation. Thorne is one of the most respected names in professional-grade supplements, and this product reflects their trademark commitment to purity and quality.

Key Benefits

• Chelated bisglycinate form provides superior absorption compared to conventional iron salts
• Gentle on the digestive system — significantly less constipating than ferrous sulfate
• 25mg dose supports healthy iron levels without excess
• Supports healthy red blood cell production, oxygen transport, and energy metabolism
• Features bioavailable forms for superior absorption compared to standard supplements

Who Should Take This?

Iron Bisglycinate is most appropriate for individuals with confirmed or suspected iron deficiency, including menstruating women with heavy cycles, pregnant and breastfeeding women, endurance athletes, vegetarians and vegans with limited dietary iron, and anyone with iron-deficiency-related fatigue or low ferritin. Our doctors recommend testing iron and ferritin levels before supplementing, and Thorne’s bisglycinate form is the choice we trust when supplementation is indicated due to its superior tolerability and efficacy.

How to Use

• Serving Size: 1 capsule (25mg elemental iron)
• Timing: Best absorbed on an empty stomach; if GI sensitivity occurs, take with a small amount of food. Avoid taking with calcium-rich foods or supplements
• Duration: As directed by your healthcare provider; iron levels should be retested after 8–12 weeks to guide ongoing dosing decisions
• Stacking: Vitamin C enhances iron absorption — consider pairing with a vitamin C supplement or vitamin C-rich food; avoid taking simultaneously with calcium or zinc

Our Doctors’ Take

Our doctors recommend Thorne Iron Bisglycinate specifically because the bisglycinate chelate form resolves the single biggest barrier to iron supplementation compliance — digestive side effects. We see iron deficiency as a frequently underdiagnosed contributor to fatigue, brain fog, and reduced recovery in our patient population, particularly among women of reproductive age. Thorne’s manufacturing standards are among the highest in the supplement industry, and we are confident in recommending their iron as a safe and effective first-line option.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.