L-tryptophan is an essential amino acid: the body cannot make it, so it must come from diet or supplementation. It occupies a special place in metabolism as the precursor to serotonin, a neurotransmitter involved in mood regulation, and subsequently to melatonin, the hormone that governs the sleep-wake cycle.

In practice, part of the tryptophan you consume is transformed, step by step, into 5-HTP then serotonin, and finally into melatonin as night falls. This biochemical cascade is why this amino acid is traditionally associated with evening relaxation and calmer sleep onset. Osavi’s 500 mg per capsule is a generous dose, taken as a single daily serving.

Osavi has built its reputation in Europe on a “clean label” approach: streamlined formulas with no unnecessary additives, designed for good tolerance. This L-Tryptophan 500 mg reflects that philosophy well — its composition fits in two lines: L-tryptophan and the plant-based hydroxypropyl methylcellulose (HPMC) capsule shell.

The product is vegan, with no added sugar, gluten, lactose, soy, and is non-GMO. The 60 vegetable capsules cover a two-month course at one capsule a day — a practical format to trial the amino acid or for a maintenance course. Every batch is lab-tested.

Osavi L-Tryptophan is of particular interest to people with restless sleep or difficulty falling asleep, as well as those going through periods of nervous tension or a passing low mood. Busy Parisian rhythms can disrupt the body clock, making support with a melatonin precursor especially relevant. It also suits people following a vegetarian or vegan diet, as the capsule shell and formula are entirely plant-based.

The Osavi recommended dose is 1 capsule per day, swallowed with a large glass of water, ideally 30 minutes before bed — it’s in the evening that tryptophan is most useful, as the body starts producing melatonin. For best results, it’s often advised to take it away from a protein-rich meal, as other amino acids compete with tryptophan to cross the gut and then the brain barrier. Do not exceed the recommended daily dose.

Not recommended for children, pregnant or breastfeeding women, or people on antidepressant treatment without medical advice.

What’s the difference between the 60 and 90 capsule formats?

The dose is identical (500 mg of L-tryptophan per capsule). The 60-capsule format covers a two-month course, the 90-capsule format three months — the 60 is ideal for a first course or occasional maintenance.

When should L-Tryptophan be taken?

In the evening, about 30 minutes before bed, away from a protein-rich meal to support its assimilation.

Is Osavi L-Tryptophan vegan?

Yes. The capsule is made from plant-based HPMC and the formula contains no animal-derived ingredient, gluten, lactose, soy or GMOs.

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.