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Our doctors see iron insufficiency routinely, particularly in women, endurance athletes, and anyone eating a predominantly plant-based diet. Most standard iron supplements cause enough digestive discomfort that patients stop taking them before their levels recover. Ferrochel bisglycinate is the chelated form we return to because patients tolerate it well, complete the course, and see their ferritin move. We recommend pairing it with a blood test to confirm your baseline and track progress.
About this product
Iron Bisglycinate
Thorne Iron Bisglycinate is a daily iron supplement providing 25 mg of elemental iron per capsule in the form of Ferrochel iron bisglycinate, a chelated form of iron studied for superior absorption and minimal gastrointestinal side effects compared with standard ferrous sulphate.
Iron is an essential mineral involved in red blood cell formation, normal energy metabolism, cognitive function, and the reduction of tiredness and fatigue. When levels fall — whether through heavy periods, a plant-based diet, athletic training, or poor absorption — the effects accumulate gradually: persistent fatigue, difficulty concentrating, and in some cases hair thinning. These are easy to miss or attribute to other causes, which is why a blood test to confirm ferritin or haemoglobin levels is always the right starting point.
This supplement suits those with confirmed or suspected iron insufficiency who have previously found iron supplements hard to tolerate. The bisglycinate chelate binds iron to two glycine molecules, protecting it from compounds in food that would otherwise block absorption, and this is the main reason it tends to cause far fewer digestive complaints than non-chelated forms.
The full ingredient list is transparent: iron bisglycinate, a hypromellose capsule, leucine, and silicon dioxide. No unnecessary fillers. Thorne is a brand with a longstanding reputation for formulation rigour, and this SKU is one of the most consistently recommended iron options in our clinic.
What it does
Benefits
- 01
Chelated iron that is gentle on the digestive system
- 02
Supports red blood cell formation and oxygen transport
- 03
May reduce tiredness and fatigue from low iron
- 04
Suits athletes, women, and plant-based diet followers
- 05
Transparent formulation with minimal inactive ingredients
Get the most from it
How to use
Take one capsule daily, or as directed by your doctor. It can be taken with or without food. For best absorption, take alongside vitamin C and avoid consuming calcium-rich foods, dairy, or tea within an hour of your dose.
What's inside
Ingredients
View full ingredient list
Iron (as Ferrochel Iron Bisglycinate) 25mg per capsule. Other ingredients: Hypromellose (derived from cellulose) capsule, Leucine, Silicon Dioxide.
Common questions
Frequently asked
Do I need a blood test before taking this?
We strongly recommend one. Iron is a nutrient where both deficiency and excess matter clinically. A simple ferritin or full blood count test confirms whether supplementation is appropriate and gives you a baseline to measure against. Taking iron without knowing your levels means supplementing blind.
Why is bisglycinate better tolerated than standard iron supplements?
Most low-cost iron supplements use ferrous sulphate, which is poorly absorbed and can cause nausea, cramping, and constipation. Bisglycinate is a chelated form — the iron is bound to glycine molecules — which protects it from compounds in food that block absorption and tends to produce far fewer digestive side effects.
Can I take this on an empty stomach?
Yes. Unlike ferrous sulphate, chelated iron bisglycinate is generally well tolerated on an empty stomach, though you can take it with food if you prefer. Avoid taking it at the same time as calcium supplements, dairy, or tea, as these can reduce absorption.
How long before I notice a difference?
Iron levels typically take several weeks to shift meaningfully. Most people notice improved energy and reduced fatigue after four to eight weeks of consistent use, though this depends on how depleted your stores were to begin with. A follow-up blood test at around three months gives a clear picture of progress.
Is this suitable during pregnancy?
Iron requirements increase significantly during pregnancy, but dosing should be guided by your midwife or doctor based on your blood results. Consult your healthcare practitioner before starting or continuing any iron supplement if you are pregnant or breastfeeding.
Doctor-guided care
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