Also known as
Main function
Hyaluronic acid is a humectant — it draws water toward itself and holds onto it. In cosmetics it's almost always used as its water-soluble salt form, Sodium Hyaluronate, since pure hyaluronic acid doesn't dissolve in water on its own.
What does this mean for melanin-rich skin?
HA is colorless and doesn't affect melanin directly — it has no bleaching or darkening properties. But melanin-rich skin tends to lose moisture faster through the barrier than lighter skin, and often looks oily on the surface while running dehydrated underneath. A weak, dehydrated barrier is more reactive, and irritation is what actually triggers post-inflammatory hyperpigmentation (PIH) — so hydration works protectively here, even though HA itself isn't a brightening ingredient.
One nuance worth knowing: low-molecular-weight HA penetrates deeper and can be more effective on fine lines, but on an already-compromised or reactive barrier, it can also trigger more irritation than the gentler high-molecular-weight form, which mostly sits on the surface and forms a protective film. Worth checking which type is in a product if your skin reacts easily.
Evidence
Barrier protection, indirectly Mechanistic
Hydration supports a healthier barrier, and a healthier barrier is less reactive — this is an indirect protective effect, not a direct pigment-fading one.
Moisture loss in melanin-rich skin Limited · Mixed
Several studies report greater transepidermal water loss in Black skin compared with White skin, though the data isn't fully consistent across every study.
Molecular weight and irritation Mechanistic
Low-molecular-weight HA's deeper penetration is well understood formulation chemistry; its higher irritation potential on compromised skin is a widely applied caution rather than a single specific trial result.
How does climate affect this?
In humid air, HA works in your favor — it pulls ambient moisture into skin the way it's meant to. But in a dry season, or an air-conditioned room, there's less moisture around to draw from. Without that supply, HA can reverse and start pulling water from your own deeper skin layers instead, leaving skin tighter and drier than before you applied it. This is a known property of humectants generally, not a flaw specific to one brand or formula.
Key considerations
- — Apply to damp skin, and seal it with a moisturizer right after, rather than letting it sit alone — this gives it moisture to draw from and locks it in.
- — In an air-conditioned or low-humidity environment, pairing HA with an occlusive (something that seals in moisture) matters more than usual.
What can you actually check?
Every cosmetic sold in Nigeria is legally required to carry a NAFDAC number. Check yours on NAFDAC's NAPAMS portal — no result, or a completely different product, is your answer.
Then check the ingredients list for "Sodium Hyaluronate" — that's the actual form used in nearly every real HA product, since pure hyaluronic acid isn't water-soluble in its acid form. A product that only says "Hyaluronic Acid" on the front, with just glycerin showing up in the ingredients, is likely leaning on a cheaper humectant instead of the one it's advertising.
- Solubility
- Water-soluble (as sodium hyaluronate)
- Typical formulation pH
- 5.0 – 7.0
- Concentration range
- 0.1 – 2%
- Best used on
- Damp skin, AM and PM
- Best for
- All skin types, especially dehydrated or barrier-compromised skin
The claims on this page draw on the following sources. Each is linked to what it supports, not cited generally.
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Moisture loss differences across skin types
Wesley NO, Maibach HI. Racial (ethnic) differences in skin properties: the objective data. Am J Clin Dermatol. 2003;4(12):843–860.
View on PubMed → -
Molecular weight, penetration, and humectant reverse effect
These are established principles of cosmetic formulation chemistry rather than single clinical trial findings — noted here as mechanistic understanding, not overstated as direct clinical evidence.
The moisture-loss finding above reflects the majority of available studies, but the underlying data across ethnic groups is genuinely mixed — flagged here as "Limited · Mixed" rather than presented as settled.
Sourcing tier: specific cited study plus general formulation chemistry.
At a glance: INCI Hyaluronic Acid / Sodium Hyaluronate · Humectant · Water-soluble · Common in serums, moisturizers, sheet masks · AM or PM · Last reviewed September 2026