Isntree Hyper ACID4 AHA BHA PHA LHA Serum 20ml

Isntree Hyper ACID4 is a wash-off exfoliating treatment combining four acid types in one 20ml formula: lactic acid and glycolic acid for AHA exfoliation, salicylic acid and capryloyl salicylic acid, an LHA type, for BHA-style exfoliation, and gluconolactone for the gentler PHA side. Niacinamide and allantoin are worked in to support the skin during the process. Unlike a leave-on acid serum, this is massaged into cleansed skin briefly, then rinsed off rather than left on overnight.

Why You'll Love It

• Combines four acid types, AHA, BHA, PHA and LHA, in a single wash-off treatment.
• Niacinamide and allantoin are worked in to support the skin during exfoliation.
• Rinse-off format limits contact time compared with a leave-on acid serum.
• Charcoal powder gives the formula a distinct dark tone reflecting its deep-cleansing intent.
• Short one-minute contact time makes it easier to control exposure than an overnight leave-on acid.

Key Ingredients

• Lactic Acid and Glycolic Acid: the AHA component of the four-acid blend
• Salicylic Acid and Capryloyl Salicylic Acid (LHA): the BHA and LHA-type acids in the formula
• Gluconolactone: the PHA component, generally considered gentler than AHA or BHA

Full Ingredients (INCI)

Water, Gluconolactone, Lactic Acid, Methylpropanediol, Glycolic Acid, Potassium Hydroxide, 1,2-Hexanediol, Diethoxyethyl Succinate, Glycerin, Xanthan Gum, Polyglyceryl-10 Laurate, Acacia Senegal Gum, Polyglyceryl-10 Myristate, Glyceryl Caprylate, Niacinamide, Salicylic Acid, Allantoin, Disodium EDTA, Ethylhexylglycerin, Peat Water, Citric Acid, Hydroxypropyl Methylcellulose, Capryloyl Salicylic Acid, Butylene Glycol, Potassium Sorbate, Charcoal Powder

How to Use

After cleansing, apply 2 to 3 drops onto the skin, avoiding the eye and lip areas. Massage into the skin for about a minute, then rinse thoroughly with lukewarm water. Use sunscreen and limit sun exposure after using this product. Use a sunscreen alongside this product during the day, since the formula includes ingredients that call for daytime sun protection.

Suitable For

Suitable for those wanting a rinse-off, multi-acid exfoliating treatment rather than a leave-on serum. Patch test first and start with less frequent use, since combining four acid types in one formula can be more active on skin than a single-acid product. Use sunscreen and limit sun exposure afterward, per the brand's own instructions.

Product Details

About Brand

Isntree is a Korean skincare brand that builds each formula around a single named active ingredient.

Isntree is a Korean skincare brand carried by Enrapture Cosmetics, built around single-focus formulas such as hyaluronic acid, mugwort and niacinamide. Shop the full Isntree range.

FAQ

Q: Is this a leave-on or rinse-off product?
Ans: Rinse-off. It is massaged into cleansed skin for about a minute, then rinsed thoroughly with lukewarm water, unlike a typical leave-on acid serum.

Q: Which four acids does ACID4 refer to?
Ans: AHA (lactic acid and glycolic acid), BHA (salicylic acid), PHA (gluconolactone) and LHA (capryloyl salicylic acid).

Q: Do I need sunscreen after using this?
Ans: Yes, the brand's own instructions explicitly recommend sunscreen and limited sun exposure after use.

Q: How often should I use a four-acid exfoliant like this?
Ans: Start with less frequent use and patch test first, since combining four acid types can be more active on skin than a single-acid product.

Q: Can I use this alongside retinol or vitamin C?
Ans: The product data does not give specific layering guidance, so consider using this on alternate nights from other strong actives until you know how your skin responds.