Brand Comparison

Biotherm vs COSRX

A head-to-head comparison of two popular K-beauty brands. Which one is right for your skin?

Our Pick

COSRX

Higher editor rating (9 vs 7.5)

Biotherm COSRX

Rating7.5/109/10

Price RangeMid-Range ($$)Budget ($)

Founded19522013

OriginMonaco, FranceSeoul, South Korea

Products331

Best ForDry, Combo, normalOily, Combo, Acne-Prone, Sensitive

PhilosophyLife Plankton — a thermal-spring microorganism — is the signature active, with a deep marine-based product architecture.Minimal, effective formulations at accessible prices. Every product built around one or two proven actives with short, transparent ingredient lists.

Biotherm

The French pharmacy brand most people forget exists. Life Plankton Essence is a legitimate hero serum that's been consistently reformulated since 1952. Aquasource gel moisturizer is a classic. L'Oréal ownership has watered down the 'prestige pharmacy' positioning a bit. Still a reasonable pick for hydration-forward routines.

Pros

✓ Life Plankton has real research behind it
✓ Strong hydration-focused lineup
✓ Widely available globally
✓ Reasonable premium-pharmacy pricing

Cons

✗ Brand energy has dipped in 2020s
✗ Formulations less distinctive than they used to be
✗ Not really a pharmacy brand — sold mostly at Sephora/department stores

COSRX

The gateway brand for most people entering K-beauty, and for good reason. COSRX consistently delivers effective, no-frills products at prices that make most Western alternatives look overpriced. Their snail mucin line and BHA products are genuine category leaders. They rarely innovate, but they execute the basics exceptionally well.

Pros