Zinc PCA and Salicylic Acid for Oily Skin: Keeping Shine Down Without Stripping
A two-serum routine that pairs a pH-balanced soothing serum with a gentle BHA ampoule to manage oil and irritation without disrupting your barrier.
Using zinc PCA and salicylic acid in a split AM/PM routine — rather than layering them together — lets you address both shine and congestion without over-exfoliating. In the morning, the AESTURA A-CICA 365 Soothing Relief Serum pH4.5 helps keep skin calm and comfortable. At night, the ROUND LAB Pine Calming Cica Ampoule brings gentle exfoliation to refine texture while you sleep.
Who This Routine Is For
If your skin is oily but also easily irritated, you've probably felt stuck between products that control shine and products that don't cause redness. Strong BHAs can strip; heavy zinc formulas can feel clinical. This routine is designed for that middle ground — oily, congestion-prone, or sensitive skin that needs both oil management and barrier support without the kind of over-exfoliation that leaves skin tight and reactive.
It works equally well if you've recently over-exfoliated and are trying to rebuild, or if you want a sustainable daily practice rather than an occasional treatment. Both products in this routine are fragrance-free and formulated with sensitive skin in mind. If you are pregnant, breastfeeding, recovering from a procedure or using prescription skincare, check the brand's current guidance and ask your doctor.
The Logic: AM Zinc, PM BHA
The reason to split these two serums across morning and night comes down to what each one does and when that function is most useful.
Zinc PCA is an oil-regulating ingredient that also soothes. It works best in the morning, when it can help manage sebum production throughout the day. The AESTURA A-CICA 365 Soothing Relief Serum pH4.5 pairs Zinc PCA with Niacinamide, Gluconolactone, and Sodium Hyaluronate in a mildly acidic pH4.5 formula designed to help maintain your skin's mildly acidic pH and calm temporary redness from environmental exposure.
Capryloyl Salicylic Acid — sometimes written as LHA — is a lipophilic derivative of salicylic acid that exfoliates more gradually and gently than standard BHA. The ROUND LAB Pine Calming Cica Ampoule uses it alongside pine leaf extract and centella asiatica-derived actives, which makes it a better fit for nighttime, when exfoliation can work undisturbed and your skin enters its repair phase. Keeping the BHA at night also reduces any theoretical sensitivity to light exposure.
Morning: AESTURA A-CICA 365 Soothing Relief Serum pH4.5
After cleansing and toning in the morning, apply the AESTURA A-CICA 365 Soothing Relief Serum pH4.5 to your whole face. Take a small amount, press it in with your fingertips, and give it a few pats to encourage absorption. The texture is a fast-absorbing liquid, so it settles within about thirty seconds without leaving any stickiness.
The serum's pH4.5 formulation is the detail worth understanding. Most skin sits at a naturally mildly acidic pH, and many common skincare steps — tap water, some cleansers, alkaline toners — can temporarily push that higher. Using a mildly acidic serum in the morning may help restore that balance before you apply SPF and go about your day. The Niacinamide in the formula also supports oil regulation, working alongside the Zinc PCA so the two are complementing rather than duplicating each other. Follow with a moisturizer or cream, then sunscreen.
Night: ROUND LAB Pine Calming Cica Ampoule
In the evening, after cleansing and toning, apply one to two drops of the ROUND LAB Pine Calming Cica Ampoule and tap gently until absorbed. The water-gel texture sits lightly on skin, and because the LHA in this formula is gentler than traditional salicylic acid, you don't need to wait or buffer it — it can go directly on skin after your toner.
