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Compatibility  /  BHA (salicylic acid)

BHA (salicylic acid)

INCI · Salicylic Acid

A beta-hydroxy acid that exfoliates inside pores for a clearer-looking complexion.

More on this ingredient: read the guide.

What BHA (salicylic acid) layers with
Copper peptides (GHK-Cu)

As with other exfoliating acids, the low pH is commonly cited as a reason to keep BHA and copper peptides in separate routines.

Separate — AM / PM
Argireline

Peptide + BHA caution is largely precautionary for finished products.

Use with caution
Matrixyl

Precautionary; the interaction concern is theoretical rather than demonstrated.

Use with caution
SNAP-8

As with other peptides, this caution is more lore than established fact.

Use with caution
Vitamin C (L-ascorbic acid)

Two acidic actives in one layer can feel like a lot; many prefer to separate them.

Use with caution
Retinoids (retinol)

As with AHAs, combining a retinoid and BHA can be a lot for the skin barrier — introduce gradually or alternate.

Use with caution
AHAs (glycolic / lactic acid)

Combining exfoliating acids increases total exfoliation and the chance of over-doing it — use sparingly and not every day.

Use with caution
Benzoyl peroxide

Both can be drying; many use them on alternate days rather than the same layer.

Use with caution
Niacinamide

A common, comfortable pairing.

Compatible
Sunscreen (SPF)

No conflict: salicylic acid goes underneath, sunscreen last. An exfoliating acid can leave skin a little more sun-reactive, which is a reason to wear sunscreen rather than to avoid the pairing. Let the salicylic acid absorb first, then apply sunscreen as an even final layer, and reapply through the day as usual.

Compatible
Ceramides

A sensible counterweight. Salicylic acid clears the follicle and can dry the surface; a ceramide moisturiser afterwards keeps that drying from tipping into a compromised barrier.

Compatible
Hyaluronic acid

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
Vitamin E

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
Azelaic acid

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
Bakuchiol

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
Tranexamic acid

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
Alpha-arbutin

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
Kojic acid

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
Squalane

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

Not studied
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