Selenium is essential to around 25 selenoproteins with varied functions, including glutathione peroxidase, which protects cells from oxidative stress, and the iodothyronine deiodinases involved in thyroid hormone metabolism. Selenium contributes to normal immune function and the maintenance of normal hair and nails. Recommended intake is 55–70 mcg/day for adults, but European soils — particularly French soils — are relatively poor in selenium compared with American soils, often leading to insufficient dietary intake.

L-selenomethionine, the pure organic form bound to the amino acid methionine, is absorbed at over 90% by the intestine — versus around 50% for sodium selenite — and follows the same absorption pathways as methionine. Unlike selenised yeast, whose composition can vary batch to batch, pure L-selenomethionine guarantees a constant, reproducible content, and this yeast-free formula also suits people sensitive to yeast.

Brazil nuts are the richest dietary source (up to 90 mcg per nut, though highly variable), followed by fish and seafood (30–80 mcg per 100g), organ meats, whole grains, eggs and meat. French soils are relatively poor in selenium, which affects plant — and by extension animal — produce, so supplementation can help fill the gap simply and reliably.

Take 1 tablet a day with a meal and a glass of water. EFSA sets a safe upper limit of 300 mcg/day for selenium, so account for dietary intake and any other selenium-containing supplements.

Not a substitute for a varied, balanced diet. Store away from heat and direct light. If pregnant, breastfeeding, or under medical treatment, consult a healthcare professional before use.

What is the difference between selenomethionine and sodium selenite?

Selenomethionine is an organic form bound to methionine, absorbed at over 90% and stored in body proteins. Sodium selenite is inorganic, absorbed at only around 50% and not stored the same way — making selenomethionine the reference form for supplementation.

Is NOW Foods selenium suitable for people sensitive to yeast?

Yes — unlike many selenium supplements that use selenised yeast, this formula contains pure L-selenomethionine with no yeast at all.

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.