Hyaluronic Acid

SODIUM HYALURONATE

The moisture magnet — instant surface hydration with honest limits on what it can do long-term.

humectantskin conditioningCAS 9067-32-7

Why it works

Hyaluronic acid holds many times its weight in water, forming a hydrating film that immediately plumps the surface and softens the look of dehydration lines. Different molecular weights penetrate differently; most benefit stays in the upper layers.

Concentration matters

Typically used at 0.1–2% — more isn't better and can feel tacky. In very dry air, pair with a moisturizer to seal it in.

The evidence, by concern

Dryness

Good evidence

Reliable, measurable hydration boost — quickly

How sure are we

good

How much it helps

modest but real

Do studies agree

strongly agree

Controlled studies consistently show topical hyaluronic acid increases skin hydration and elasticity within 2–8 weeks (and visibly within hours). One of the most dependable effects in skincare.

The receipts

71 trials/reviews indexed · showing most cited

Wrinkles & aging

Early evidence

Softens the look of lines by hydration, not structure

How sure are we

early

How much it helps

subtle

Do studies agree

mostly agree

Trials showing wrinkle improvement are mostly short, industry-funded, and consistent with a temporary plumping effect rather than structural change. Real benefit, honest mechanism — just don't expect retinoid-style remodeling.

The receipts

64 trials/reviews indexed · showing most cited

Safety, without the fear

Anchored to regulatory assessments — not hazard lists. Dose makes the poison; these are the conclusions at real-world cosmetic use.

CIR · Cosmetic Ingredient Review

CIR assessed hyaluronic acid as safe as used; it's biologically native to skin and essentially non-irritating. One of the safest ingredients in cosmetics.

Source →

Spotted an error, or a study we missed? Claims were fact-checked against the cited literature in August 2026; independent clinical sign-off is pending — corrections welcome.