Silicon is a trace element naturally present in the body’s connective tissues, involved in the synthesis of collagen and elastin, two fundamental proteins for the structure of skin, cartilage, bone, hair and nails, and also plays a role in keratin formation and maintaining the suppleness of blood vessel walls.

Tissue silicon concentration naturally declines with age, more sharply from 40 onwards, correlating with reduced endogenous collagen production and showing up as reduced skin firmness, thinning hair and less joint suppleness — highly bioavailable silicon supplementation aims to offset this natural decline and support the structural function of connective tissue.

Prosagen Si is a patented form of orthosilicic acid stabilised with fish collagen peptides. In its free form, orthosilicic acid is naturally unstable and tends to polymerise quickly, considerably reducing intestinal absorption; by binding it to collagen peptides, Prosagen Si mimics the biomimetic structure of silicon as it occurs in human connective tissue.

Comparative studies show Prosagen Si’s bioavailability is twice that of choline-stabilised silicon, the most commonly used form in classic supplements — at an equal dose, the body absorbs more elemental silicon with Prosagen Si, making it one of the best-performing silicon forms on the supplement market.

Take 2 capsules a day, with a meal and a large glass of water, which supports silicon absorption and limits any digestive discomfort. A minimum 3-month course is recommended to see meaningful results, as effects on skin, hair and nails appear progressively as these tissues renew over several weeks; a 60-capsule bottle covers one month, so plan on 3 bottles for a full course.

This product contains fish collagen peptides and is not recommended for people with a fish allergy. Not recommended for pregnant or breastfeeding women without prior medical advice. For adult use only. Do not exceed the recommended daily dose. A food supplement is not a substitute for a varied, balanced diet and a healthy lifestyle. Store in a cool, dry place, away from light. Keep out of reach of children. If you are on medical treatment, consult your healthcare professional before starting supplementation.

What is the difference between Prosagen Si and choline-stabilised silicon?

Prosagen Si is orthosilicic acid stabilised with marine collagen peptides, while choline silicon is stabilised with choline; the main difference is bioavailability, with Prosagen Si absorbed twice as well according to EFSA-validated data. Prosagen Si also supplies collagen peptides at the same time, adding further benefit for skin, hair, nails and joints.

How long before I notice the first results?

Silicon’s effects appear progressively — skin renews in 4-6 weeks, nails in 3-6 months, and hair over several months, which is why a minimum 3-month course is recommended. The first signs of improvement generally involve skin quality and nail strength.

Is Prosagen Si suitable for vegetarians?

The capsule shell is pullulan, a plant-based material. However, Prosagen Si contains fish collagen peptides, so this product isn’t suitable for strict vegetarians or vegans, though it suits people who eat fish (a pescatarian diet). People with a fish allergy should avoid this product.

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.