Su:m37°
LG's fermentation-first luxury line — naturally derived, 365-day brewed.
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Su:m37° bet its entire identity on one idea: ferment everything, for exactly 365 days, and don't add synthetic preservatives. The Secret Essence is what happens when that philosophy actually works — a naturally-fermented essence with legitimate cult status. Not cheap, not preachy, and the formulas have held up for 15+ years.
Strengths
- + Serious fermentation science
- + Minimal synthetic preservatives
- + Cult Secret Essence
Weaknesses
- − Luxury pricing
- − Heavy natural fragrance
- − Spa-lady packaging
The Su:m37° Story
Launched in 2007 by LG Household & Health Care, Su:m37° (sum meaning "breath," 37° referencing body temperature) built its identity around natural fermentation. Their flagship Secret Essence is fermented for a full 365 days using 80+ plant extracts before bottling — a process the brand leans on hard, and which their R&D lab in Ulsan has published on. The brand sits in LG's luxury tier alongside The History of Whoo but leans "clean science" rather than "royal hanbang."
Shop Su:m37° by skin type
Curated picks from Su:m37°'s lineup, ranked for each skin type.
All Su:m37° Products
6 products reviewed and rated.
Secret Essence
LG's answer to SK-II Pitera — a naturally fermented essence that takes 50+ days in controlled fermentation tanks. The glow is real, the texture is water-thin, and the ferment is genuinely different from galactomyces. If SK-II is the J-beauty first treatment essence, Su:m37° is the K-beauty equivalent.
Losec Summa Elixir Cream
Su:m37°'s flagship anti-aging cream — the Losec Summa Elixir is the Korean luxury answer to La Mer or Sulwhasoo's most premium tier. 80 fermented ingredients (Cytosis Complex 80) plus EGF + IGF growth factors plus a peptide stack plus a barrier-rebuilding ceramide-cholesterol-squalane base. This is the cream Korean executives buy as a luxury-skincare gift. Whether it's 'worth' $380 depends entirely on how much you value the LG-luxury sensory experience and the Korean-fermentation story. Objectively well-formulated; subjectively, a luxury indulgence.
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