Thorne Iron Bisglycinate 25mg vs Gentle Iron (Iron Bisglycinate) 20mg Vegetable 180 Capsules

Pros

• ✓Bisglycinate (Ferrochel®) form is highly bioavailable and consistently reported as gentle on the stomach with no constipation or nausea
• ✓Measurable improvements in ferritin and hemoglobin confirmed by multiple reviewers via blood tests
• ✓NSF Certified for Sport — independently verified for purity and label accuracy
• ✓Ultra-clean formula: only pharmaceutical-grade excipients, no magnesium stearate, fully vegan and allergen-free

Cons

• ✗No vitamin C included — absorption is suboptimal without pairing with ascorbic acid (users note this and add their own)
• ✗25 mg dose may be insufficient for severe iron deficiency recovery; therapeutic correction often requires higher daily intake
• ✗Premium pricing — noticeably more expensive per serving than ferrous sulfate or gluconate alternatives
• ✗At least one reviewer with chronic severe malabsorption found no improvement, ultimately requiring IV iron infusion

Best For

Pros

• ✓Iron bisglycinate form is exceptionally gentle — virtually no constipation or GI irritation across the large majority of reviewers
• ✓Multiple users confirm measurable ferritin and haemoglobin improvements via blood tests
• ✓Widely reported improvements in energy levels, reduced fatigue, and better hair condition
• ✓Certified vegan, Kosher Parve, Halal, Non-GMO, gluten-free, and dairy-free — suitable for restricted diets

Cons

• ✗20mg dose is conservative and may be insufficient for severe iron deficiency without taking 2–4 capsules daily, which increases cost significantly
• ✗Not third-party tested for purity or label accuracy
• ✗Requires avoiding calcium-rich foods or supplements near dosing time and ideally co-administration with vitamin C — some find this inconvenient
• ✗Isolated reports of digestive upset, suggesting individual tolerance still varies

Best For