Iron Bisglycinate

Name: Thorne Iron Bisglycinate
Brand: Thorne
Price: 16.00 USD
Availability: InStock

Best in ClassIron

The best iron supplement available. Bisglycinate chelate form has strong clinical evidence for absorption and dramatically reduced GI side effects compared to ferrous sulfate. 25mg per capsule allows flexible dosing. NSF Certified for Sport.

88/ 100

Biorank Score

Independently ranked

88/ 100

Biorank Score

Independently ranked by Biorank Laboratories

Our Verdict

Best in Class

Thorne Iron Bisglycinate earns the top iron score through the combination of the most evidence-backed chelated form, NSF Certified for Sport verification, and excellent value. The 25mg dose per capsule allows flexibility (1 cap for maintenance, 2 for repletion). No hype penalty -- Thorne markets this straightforwardly. The form genuinely reduces the GI side effects that cause most people to quit iron supplementation.

Key Findings

Iron bisglycinate produces significantly fewer GI side effects than ferrous sulfate
Chelated form allows absorption even with food inhibitors (phytates, tannins)
25mg flexible dosing -- 1 cap maintenance, 2 caps for repletion
NSF Certified for Sport -- highest quality verification available

Evidence Analysis

Iron bisglycinate (Ferrochel) has been extensively studied and consistently demonstrates superior tolerability compared to ferrous sulfate -- the most commonly prescribed iron form. A systematic review (Name et al., 2018) found that bisglycinate produces significantly fewer GI side effects (nausea, constipation, cramping) while achieving equivalent or superior absorption. The chelated form protects iron from food inhibitors (phytates, tannins), allowing it to be taken with or without food. Studies in pregnant women show effective hemoglobin restoration with fewer dropouts due to side effects.

Ingredient Breakdown

Ingredient	Dose	Effective Dose	Adequacy	Verdict
Iron (Bisglycinate Chelate / Ferrochel)	25mg	18-65mg (depending on deficiency severity)		Optimal

True Cost Analysis

Properly Dosed -- What You Pay Is What You Get

Listed Price

$0.27/serving

$8.10/month at 1 serving/day

True Cost Per Effective Dose

$0.27/effective dose

$8.10/month for effective dosing

Value Score

Excellent value

Save $6.90/month (85%)

by switching to Nature Made Iron 65mg

Where It Falls Short

25mg per capsule may require 2 capsules for severe deficiency (50mg). Slightly more expensive than generic ferrous sulfate (but the tolerability difference makes it worthwhile). Only available in capsule form.