Check the sunscreen warning statement on AHA exfoliant toner and pad containers

What warning statements appear on AHA cosmetics?

Alpha-hydroxy acids (AHAs), such as glycolic acid and lactic acid, soften the bonds holding dead skin cells to the surface. However, once those old cells slough off, the skin's barrier against ultraviolet light temporarily thins.

Annex 1 of the MFDS "Standards on Warnings and Fragrance Allergen Labeling in Cosmetics" requires the following statements on packaging for products containing more than 0.5% AHA.

Leave-on products such as toners, serums, creams, and peeling pads must carry both statements.

Should sunscreen be worn only when applying AHA during the day?

Many people apply AHA exfoliating products only right after evening cleansing. However, newly exfoliated skin can react sensitively to sunlight not just immediately after application, but throughout the following day as well.

Therefore, even if you used an AHA toner or pad the night before, apply sunscreen thoroughly before going outside the next day. When selecting a daily sunscreen, read Check the new benzophenone-3 warning statement on the back of sunscreen to confirm if the formula fits your needs. If the sunscreen has been sitting on your vanity for a while, review its opening date as described in Check cosmetic expiration dates and opening dates before autumn vanity organizing.

What additional warning appears on high-concentration AHA products?

Some at-home peeling serums and ampoules contain more than 10% AHA or have a pH below 3.5. Because these formulas soften dead skin rapidly, the risk of skin irritation also increases.

The MFDS regulation requires an additional warning statement beyond the standard text for products exceeding 10% AHA or with a pH under 3.5:

"Contains high concentrations of AHA, which may cause adverse reactions; consult a physician or dermatologist."

If your skin barrier is thin or dry and reddened from seasonal changes, avoid applying high-concentration products over the entire face right away, and gradually adjust the frequency and amount.

In what order should you check toner or pad containers?

When checking an exfoliant container in a store or on your vanity, follow these four steps:

1. Look at the full ingredient list to see where AHA names such as Glycolic Acid, Lactic Acid, or Mandelic Acid are placed.
2. In the "Precautions for Use" section on the back of the bottle or box, read whether the sunscreen companion statement and patch test statement are printed.
3. If using a new brand or concentration for the first time, apply a small amount behind the ear or under the jaw to check for stinging or itching.
4. Set out a sunscreen on your vanity beforehand so you can apply it before leaving the house the next morning.

If the ingredient list contains fragrance or other active compounds, compare them with the checklist in Find 25 fragrance allergens in cosmetic full ingredient lists. Thoroughly reading the small text on containers that touch your skin is the foundation of healthy skincare.