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Ingredient guide
tromethamine
In short
Tromethamine is a pH adjuster that keeps formulas stable and comfortable on the skin. It helps products stay effective without making them strongly alkaline.
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Best used
Anytime
What it is
Organic amine used as a pH adjuster and buffering agent in aqueous formulas. Maintains product stability without the strong alkalinity of sodium hydroxide. Common in gentle, low-irritation formulations.
Also found as
Where to find it
CeraVe AM Facial Moisturizing Lotion with SPF 30
La Roche-Posay Anthelios Melt-in Milk Sunscreen SPF 60
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Common questions
It stabilises a product’s pH so the texture and active ingredients remain consistent.
Yes, it’s commonly used in gentle formulas because it adjusts pH without being harsh.
You’ll see it in moisturisers, sunscreens, and serums that rely on steady pH for performance.
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Personal guidance only · For clinical concerns, see a dermatologist.