Hyaluronic acid: the molecule that keeps your tissues alive.

6 min. read

10/07/2026

L'acide hyaluronique : la molécule qui maintient vos tissus en vie.

Cell Longevity · Journal

Hyaluronic Acid: The Molecule That Retains Water in Your Tissues

It can hold up to 1,000 times its weight in water. Yet, its concentration in the skin drops by nearly half by age 50, often without any noticeable signs.

What You Need to Know

Hyaluronic Acid: More Than Just a Cosmetic Ingredient

Hyaluronic acid (HA) is a molecule naturally produced by our body, present in almost all our tissues: skin, joints, eyes, cartilage, vascular walls. Its fundamental property is its ability to capture and retain water: up to 1,000 times its own weight.

This property gives it its role as a natural lubricant and hydrating cushion in tissues. In the skin, it is part of the extracellular matrix, where it contributes to volume and suppleness. In the joints, it is a component of synovial fluid and surrounds cartilage. In the eyes, it is involved in the hydration of the vitreous humor.

Long confined to aesthetics (injections, creams), hyaluronic acid also exists in oral form. Published studies describe intestinal absorption, followed by distribution through circulation, reaching areas that topical treatments cannot.

Acide hyaluronique et hydratation tissulaire: Journal BIOLOGYST — Fig. 1: The Role of Hyaluronic Acid in Tissue Hydration

Scientific Reference

Hyaluronic Acid: A Key Molecule in Skin Aging

Papakonstantinou E., Roth M., Karakiulakis G. · Dermato-Endocrinology · 2012 · Vol. 4(3) · pp. 253–258

This reference review establishes that from the age of 25, hyaluronic acid production gradually decreases. By age 50, skin concentration has dropped by nearly 50%. The authors report that this loss is associated with tissue dehydration, decreased skin volume, loss of elasticity, and increased vulnerability to environmental aggressors.

What this means in practice: the visible aging of the skin is not just about collagen. The authors also associate it with a loss of interstitial water, and hyaluronic acid is the molecule that retains this water.

Access publication →

“Skin aging isn't just about collagen: the authors also describe a loss of the water that gives skin its volume.”

Why We Run Low

Silent Loss, Visible Consequences

The decrease in hyaluronic acid is a natural process, but it is accelerated by several daily factors:

Factors Accelerating Hyaluronic Acid Loss

Age

Synthesis decreases from age 25. By age 50: −50% in the skin. By age 70: almost absent in the deep layers of the dermis.

Oxidative Stress

Free radicals fragment and degrade HA chains. Pollution, tobacco, UV rays, and chronic stress are the main culprits.

Chronic Inflammation

Inflammatory enzymes (hyaluronidases, MMPs) accelerate the degradation of HA in the extracellular matrix.

Dehydration

Insufficient water intake reduces HA's ability to fulfill its role as a water reservoir in tissues.

Sun Exposure

UVA rays penetrate the deep dermis and directly degrade HA stores, accelerating skin aging.

The signs associated with this in the literature appear gradually: dull and less plump skin, less flexible joints, a sensation of dryness, increased sensitivity to aggressors. These signals are often attributed solely to fatigue or stress.

Three Key Figures

1,000×

Its weight in water retained by hyaluronic acid

−50%

Of HA stores lost by age 50

218 mg

Of HA per course in the Antioxidant Defense formula

The BIOLOGYST Formulation

Antioxidant Defense: A Formulation at the Interface of Skin, Cell, and Tissue

Antioxidant Defense was formulated around the two documented mechanisms of HA loss: oxidative stress that degrades it, and the lack of renewal that depletes it. The formula combines direct low molecular weight HA intake with antioxidant active ingredients.

Key Active Ingredients · Mechanisms of Action

Active Ingredient	Role
ExceptionHYAL® Star (240 mg)	Patented form of very low molecular weight hyaluronic acid, providing 218 mg of pure HA. Published studies on this form describe superior intestinal absorption and tissue bioavailability compared to standard HA, due to the reduced chain size. See also our dossier Active Ingredients.
Quercetin (427.5 mg)	Flavonoid studied for its inhibitory action on metalloproteinases (MMPs): enzymes that degrade HA and collagen. Authors also describe modulation of the NF-κB pathway and stabilization of mast cells.
Setria® L-Glutathione (375 mg)	Described in the literature as the main intracellular antioxidant. Publications report its role in neutralizing free radicals, in hepatic detoxification, and in maintaining cellular redox potential via the GSH/GSSG cycle.
Vitamin C (150 mg · 187.5% NRV)	Vitamin C contributes to normal collagen formation and to protecting cells from oxidative stress. It is a cofactor for hydroxylases involved in this synthesis, participates in the Nrf2 pathway, and regenerates glutathione and vitamin E.

“Providing hyaluronic acid without protecting what you provide is like filling a leaky bucket.”

Is This For You?

For Those Interested in Their Cellular Capital

Antioxidant Defense was formulated for those concerned by the mechanisms described above: tissue hydration, oxidative stress, HA renewal. The following profiles inspired the formulation:

Relevant Profiles

Dehydrated or dull skin

Lack of radiance, dull complexion, tight skin. The mechanisms described in the literature are located within the tissues, not on their surface.

Early signs of aging

Loss of facial volume, dehydration fine lines, less plump skin. HA stores begin to decrease well before age 30.

High oxidative stress

Demanding lifestyle, urban pollution, sun exposure, intense sports activity. Free radicals preferentially degrade HA.

Joints and mobility

HA is a component of synovial fluid. Its renewal is among the mechanisms studied in joint flexibility and cartilage lubrication.

Reactive skin

Quercetin is studied for its stabilizing action on mast cells, cells involved in skin reactivity. Persistent reactive skin requires dermatological consultation.

Recommended Dosage

How to take Antioxidant Defense. 2 to 3 capsules per day, preferably in the morning on an empty stomach or before meals, to optimize the absorption of HA and antioxidants. Take for 2 to 3 months, repeatable: observations reported on skin quality and tissue hydration generally span a period of at least 6 weeks.

Discover Antioxidant Defense

Precautions. Food supplement not a substitute for a varied and balanced diet. Not recommended for pregnant and breastfeeding women.

The BIOLOGYST range enriched with hyaluronic acid

Three formulas, one molecule: choose the one that suits you

Hyaluronic acid is present in three BIOLOGYST formulations: each with its own formulation focus and associated active ingredients.

No. 06 · Power Hydra Flow: 100 mg of HA

Hyaluronic acid: 100 mg (ExceptionHYAL® Star) · Stick, 1 per day.

Combination of OVODERM® egg membrane and vitamin C, which contributes to normal collagen formation. The egg membrane is studied for its contribution of extracellular matrix constituents.

Dosage: 1 stick/day in the morning · 2-3 month course.

View Power Hydra Flow →

No. 12 · Vital Flow: 136.5 mg of HA

Hyaluronic acid: 136.5 mg · Capsules, 2 to 3 per day.

Combination of ABG10+® black garlic, resveratrol, and CoQ10, active ingredients studied for their action on endothelial function and microcirculation.

Dosage: 2-3 capsules in the morning · 2-3 month course.

View Vital Flow →

No. 13 · Antioxidant Defense: 218 mg of HA

Hyaluronic acid: 218 mg (ExceptionHYAL® Star · highest dose in the range) · Capsules, 2 to 3 per day.

Combination of Setria® glutathione and quercetin, supplemented with vitamin C which helps protect cells against oxidative stress and contributes to normal collagen formation.

Dosage: 2-3 capsules on an empty stomach in the morning · 2-3 month course.

View Antioxidant Defense →

The three formulas are complementary and can be combined as needed. If in doubt about the most suitable formula for your profile, consult your healthcare professional.

Explore the active ingredients

Frequently Asked Questions

Is oral hyaluronic acid absorbed?

Published studies describe intestinal absorption, followed by distribution into tissues, where topical treatments do not penetrate. For very low molecular weight forms, such as ExceptionHYAL® Star, authors report superior intestinal absorption and tissue bioavailability compared to standard HA.

At what age do we start losing hyaluronic acid?

Synthesis decreases from age 25. By age 50, skin concentration has dropped by approximately 50%, and by age 70 it is almost absent from the deep layers of the dermis (Papakonstantinou et al., Dermato-Endocrinology, 2012).

Which BIOLOGYST product contains the most hyaluronic acid?

Antioxidant Defense provides the highest dose in the range: 218 mg of pure HA (ExceptionHYAL® Star), combined with Setria® glutathione, quercetin, and vitamin C. This is followed by Vital Flow (136.5 mg) and Power Hydra Flow (100 mg).

Power Hydra Flow, Vital Flow, or Antioxidant Defense: which one to choose?

The three differ in their associated active ingredients: OVODERM® egg membrane and vitamin C for Power Hydra Flow; ABG10+® black garlic, resveratrol, and CoQ10 for Vital Flow; Setria® glutathione, quercetin, and vitamin C for Antioxidant Defense. The three are complementary and can be combined. If in doubt, ask your healthcare professional for advice.

How long does a hyaluronic acid course last?

Allow 2 to 3 months, renewable. Reported observations on skin quality and tissue hydration generally cover a period of at least 6 weeks. Other analyses are published in the BIOLOGYST Journal.