Keratin is the fibrous protein that forms the main framework of hair, nails and skin. It makes up nearly 90% of the hair shaft’s composition and gives hair its mechanical strength, elasticity and natural shine. When the body’s own keratin production declines — due to stress, nutritional shortfalls, ageing or external damage — hair weakens, becomes brittle and loses volume. The hydrolysed keratin used by Dynveo is obtained through controlled enzymatic hydrolysis, which breaks the protein into small peptides, greatly increasing its bioavailability and intestinal absorption. Unlike whole native keratin, which the body cannot use in that form, hydrolysed peptides are directly assimilable and can be delivered to hair follicles and the nail matrix. This source of hydrolysed keratin also provides significant amounts of sulphur-containing amino acids — cysteine, methionine — the essential building blocks for the body’s own keratin synthesis.

Several clinical studies have evaluated the benefits of hydrolysed keratin supplementation on hair and nail quality. A randomised double-blind study found that after 90 days of supplementation, participants observed a significant reduction in hair breakage, improved shine, and increased tensile resistance of the hair shaft. Keratin peptides work through two complementary mechanisms: first, providing the amino acids directly needed for keratin production by hair follicle cells; second, certain bioactive peptides from hydrolysis exert a cell-signalling effect that stimulates keratinocyte activity in the nail matrix and hair bulb. Nails also benefit from this supplementation, with several users reporting fewer splits, faster regrowth and increased hardness of the nail plate after 6 to 8 weeks of regular use.

Recommended dose is one to two capsules a day, preferably taken in the morning with a meal — this optimises amino acid absorption alongside other nutrients and reduces the risk of mild digestive discomfort in sensitive individuals. For weakened hair or very fragile nails, a minimum 3-month course is recommended to see visible, lasting results — given hair’s growth cycle (2 to 6 years) and nails’ (around 6 months), some patience is required, with effects typically becoming noticeable from week 4 to 6 of regular supplementation. After the initial course, you can continue at a maintenance dose (one capsule a day) or do seasonal 2-3 month courses.

Not recommended for people allergic to proteins from the source used — read the label carefully before use. Pregnant or breastfeeding women should consult a doctor before starting any supplementation. If undergoing dermatological or medical treatment affecting keratin production, seek advice from a doctor or dermatologist before starting the course. Do not exceed the recommended daily dose. Food supplement. Not a substitute for a varied, balanced diet and a healthy lifestyle. Keep out of reach of children.

How long before I see results from Dynveo Keratine?

The first results on nail strength and reduced hair breakage generally appear between weeks 4 and 6 of regular use. For optimal, lasting effects on hair growth and quality, a minimum 3-month course is recommended — consistency is the key factor.

Is Dynveo Keratine suitable for coloured or chemically treated hair?

Yes, hydrolysed keratin works from within by providing the amino acids needed to regenerate hair fibre. It’s particularly suited to hair weakened by colouring, straightening or heat styling, complementing external hair care by acting on the hair’s internal structure.

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.