Irritation & Compatibility of Whitening Ingredients (Resorcinol, Sym-White, LHA)

Regarding the irritation levels of resorcinol and resorcinol S:

• At a 5% concentration, Activated Resorcinol S causes irritation equivalent to using Activated Resorcinol at 1%. This suggests Activated Resorcinol S is less irritating than Activated Resorcinol at the same concentration.

Regarding Sym-White:

• According to the manufacturer's research, Sym-White is the least irritating and has comparable whitening effectiveness to Activated Resorcinol. However, this is based on manufacturer studies and not independent research, so it should be considered supporting information rather than a confirmed fact. Feedback from users generally aligns with these findings.

Regarding combining resorcinol with LHA, AHA, and BHA:

• Resorcinol and LHA (Capryloyl Salicylic Acid) are different types of substances with different mechanisms of action.
• LHA is not in the same group as AHA and BHA.
• While it is technically possible to combine resorcinol and LHA, it is generally advised against combining multiple ingredients that can potentially irritate the skin in one formula, as this significantly increases the risk of irritation.