The coastal vs. inland difference
Mumbai and Chennai users applying HA on damp skin see hydration levels 2× higher at 24 hours than Delhi users applying on dry skin in winter. The protocol is not universal — it must be climate-adapted.
Hydration·
MN
Dr. Meera NairHyaluronic Acid in Indian Climate: The Humidity Paradox
4 min read J. Cosmetic Science (2023) · Climate-stratified cohort · 1,800 subjects
Hyaluronic acid is a humectant — it draws water from the environment into the skin. In high-humidity environments (Mumbai: avg 77% RH), this works exceptionally. In dry climates (Delhi: avg 40% RH winter), HA draws moisture from the dermis outward if not sealed with an occlusive.
60%
Humidity threshold
2×
Coastal efficacy
Damp
Optimal application
The correct protocol for dry climates
Always apply on slightly damp skin (after cleansing, pat dry leaving 20% moisture). Immediately follow with a moisturiser containing ceramides or squalane to seal. In Delhi winters, layer HA under a richer barrier cream.
Key ingredients · Evidence summary
IngredientConcentrationEfficacy score
Hyaluronic Acid (LMW)
Concentration
0.1%
Efficacy
88%
Hyaluronic Acid (HMW)
Concentration
1–2%
Efficacy
75%
Polyglutamic Acid
Concentration
0.5–2%
Efficacy
80%
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