Can you use glycolic acid with salicylic acid?
Pick one per night. Many products already combine them, and one exfoliant is enough.
What Vessa does with both on your shelf
Vessa fills one exfoliant slot, and will not put two products with the same headline active into a single session.
Why
An AHA and a BHA both exfoliate, one on the surface and one into the pore. Using both at once is more exposure, not more benefit, and it is the classic route to an over-exfoliated barrier.
Questions people ask next
How this answer is decided
These verdicts are the rules Vessa applies when it builds a routine, not an editorial opinion. The app schedules retinoids in the evening only, keeps exfoliants on different nights from them, puts vitamin C in the morning and sunscreen last every morning, and removes retinoids, salicylic acid and hydroquinone from consideration entirely when someone tells it they are pregnant or breastfeeding. Where the evidence is genuinely mixed, the app takes the cautious side and this page says so rather than picking one for you.
Vessa sells a subscription, not the products it recommends, and it suggests buying something only where a step is missing from what you already own. This is skincare guidance, not medical advice: anything painful, spreading or changing quickly belongs with a dermatologist.
Checked against your actual shelf
Scan the products you own and Vessa schedules them around each other, including this pair.