Chelating iron with glycine, a natural amino acid, allows the mineral to travel via the amino-acid absorption pathway in the intestinal lining. This specific mechanism bypasses the negative interactions iron usually experiences with certain dietary components such as phytates (found in grains and legumes), tannins (tea, coffee) or calcium. The result is markedly higher bioavailability, measured in comparative studies at around three times that of iron sulfate — and because more of the iron is actually absorbed, less remains in the gut to cause the usual discomforts such as constipation, nausea or abdominal pain, which is why bisglycinate is often the preferred choice for people who have given up on iron supplements due to side effects with other forms.

Iron takes part in many fundamental physiological functions. It is required for the normal formation of red blood cells and haemoglobin, ensuring oxygen transport from the lungs to every tissue in the body. A sufficient iron intake contributes to the reduction of tiredness and fatigue, to normal function of the immune system, and to the maintenance of normal cognitive function — claims authorised by EFSA (the European Food Safety Authority). Iron deficiency remains one of the most common nutritional deficiencies worldwide, particularly affecting women of childbearing age, endurance athletes, people on a vegetarian or vegan diet, and growing teenagers.

Ferrochel, developed by American laboratory Albion Minerals, is considered the global benchmark in chelated iron. It guarantees the iron is genuinely bound to two glycine molecules by a stable covalent bond, rather than simply mixed with an amino acid, as is sometimes the case with lower-quality “chelated” forms. The TRAACS label (The Real Amino Acid Chelate System) certifies the manufacturing process and molecular structure of the chelate, with every raw material batch tested by spectrometry to confirm the integrity of the iron-glycine bond — backed by over 100 published studies on its bioavailability and tolerance.

The iron supplement market offers many forms, but not all are equal in effectiveness and comfort. Iron sulfate, long the standard first choice, has limited bioavailability and frequently causes digestive issues (constipation, nausea, dark stools). Iron fumarate has a better profile but remains inferior to bisglycinate in intestinal tolerance. Iron gluconate and pyrophosphate are better tolerated but less well absorbed. Bisglycinate stands out as the best compromise between high absorption and excellent digestive tolerance, with comparative studies confirming it reaches serum ferritin levels comparable to iron sulfate, with significantly fewer side effects reported by participants.

Take 1 capsule a day with a large glass of water, ideally away from meals to maximise absorption. Allow at least a 2-hour gap from tea, coffee, dairy products or wholegrain cereals to avoid interactions with tannins, calcium and phytates — pairing with a vitamin-C-rich food (lemon juice, kiwi, pepper) helps boost iron absorption. A 60-capsule bottle covers 2 months; course length depends on iron status, typically 2 to 4 months to restore normal reserves, best guided by a blood test (serum ferritin).

Iron supplementation should not be started without first checking iron status via a blood test (ferritin, transferrin). Excess iron can be harmful. Not recommended for people with haemochromatosis or iron overload. Pregnant or breastfeeding women should consult a healthcare professional before use. Do not exceed the recommended daily dose. Keep the bottle closed in a cool, dry place away from light and humidity, out of reach of young children. Food supplements should not replace a varied, balanced diet and a healthy lifestyle.

What is the difference between iron bisglycinate and iron sulfate?

Iron bisglycinate is a chelated form where the iron is bound to two glycine molecules, allowing it to be absorbed via the amino-acid pathway in the gut. Iron sulfate, a classic inorganic form, is less well absorbed and causes more digestive side effects. Comparative studies estimate Ferrochel bisglycinate’s bioavailability at around three times that of iron sulfate.

Can Dynveo Iron Bisglycinate be taken with tea or coffee?

It is best to avoid tea and coffee within 2 hours of taking iron, as the tannins in these drinks form insoluble complexes with iron and significantly reduce absorption. For the same reason, take the capsule away from meals rich in wholegrain cereals or dairy. Pairing with vitamin C (lemon, orange or kiwi juice) clearly boosts absorption.

Who is Dynveo Iron Bisglycinate for?

It suits any adult with an increased iron need or a deficiency confirmed by blood test — particularly women of childbearing age, endurance athletes, vegetarians and vegans whose diet is low in haem iron, and people with low ferritin and persistent tiredness. A prior blood test is always recommended to tailor the course length.

How long does a course of Iron Bisglycinate last?

This depends on the initial deficiency level. For moderate deficiency, 2 to 3 months of supplementation is usually enough to normalise ferritin reserves; for more pronounced deficiency, the course may extend to 4 months or more under medical supervision. A follow-up blood test after 6 to 8 weeks helps track progress. The 60-capsule bottle covers 2 months of daily use.

Herba Barona is an independent specialist supplement shop in the heart of Paris — established in 2006. What you order is genuinely on our shelves: we ship from our own stock, with no dropshipping and no long waits.

Visit us at 10 rue Théophile Roussel, Paris 12 — or use Click & Collect and pick up your order in-store. We also deliver across France and Europe. Friendly, expert advice in English from our team.

Where is the shop?

Herba Barona is at 10 rue Théophile Roussel, 75012 Paris — a two-minute walk from Ledru-Rollin (line 8), close to Bastille. Open Tuesday to Saturday, 9:30 am–6:30 pm.

Can I order online or collect in store?

Yes. We ship across France and Europe under the same conditions as our French store, or choose Click & Collect to pick up your order for free at our Paris shop.