[ Isntree ] Hyper Acid 4 AHA BHA PHA LHA 30 Serum 20ml

RECOMMENDED FOR: Skin dealing with rough, bumpy texture and blackheads

PERFECT FOR: When rough, bumpy texture and blackheads are on your mind, and you want a strong peeling effect in a short time

AM: Not restricted to evening only, but the brand recommends it mainly after evening cleansing, likely to avoid sun exposure right after the acid peeling action.

PM: Apply to a dry face and gently roll for 1 minute, then rinse with lukewarm water (recommended once a week, do not leave on longer than 1 minute, recommended for evening use, patch test recommended before use).

A charcoal-toned, medium-to-high viscosity wash-off serum.

4-Acid Complex 30% (AHA 15.3%, BHA 0.1%, PHA 14.61%, LHA 0.01% - Glycolic Acid, Lactic Acid, Salicylic Acid, Gluconolactone, Capryloyl Salicylic Acid), Niacinamide, Allantoin, Charcoal Powder, Peat Water

- 4-Acid Complex 30% (AHA+BHA+PHA+LHA): just 1 minute of rolling intensively peels away dead skin and pore sebum for smooth, egg-like texture
- Charcoal Powder & Peat Water: regulate oil-water balance and support elasticity and turnover
- Niacinamide & Allantoin: improve skin tone during exfoliation care while maintaining hydration

A 30% 4-Acid Complex, a 1-Minute Wash-Off Intensive Peel

Isntree's Hyper Acid 4 Serum. A concentrated 30% 4-acid complex of AHA, BHA, PHA, and LHA intensively peels away dead skin and pore sebum with just 1 minute of rolling for smooth texture. Charcoal powder and peat water regulate oil-water balance.

A charcoal-toned, concentrated peeling serum in a 1-minute wash-off format.

PICK NO.3 RATING
SENSITIVITY: 3/5

WHY WE PICKED IT: The specific concentrated acid combination of 15.3% AHA and 14.61% PHA within a total 30%, combined with the clear 1-minute wash-off usage method, made this an easy pick.

CLINICAL RESULTS: Cruelty-free, reef-safe - per independent ingredient analysis platforms (Incidecoder, Skinsort). A patch test is recommended given the high acid concentration.

SAFETY NOTES: Given the high total 30% acid concentration, a patch test is recommended before use, and a tingling sensation may occur during application. Do not leave on longer than 1 minute, avoid the eye and mouth areas, avoid daytime use, and sunscreen is essential afterward.

GLOBAL SALES: Not disclosed.

AWARDS: Not disclosed.

PICKER'S COMMENT: "Not disclosed."

USAGE DURATION: Not disclosed.

Water, Gluconolactone (14.48%), Lactic Acid (10.12%), Methylpropanediol, Glycolic Acid (4.9%), 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 (20ml (0.67 fl. oz.))

Q. Why can I only leave it on for 1 minute?
A. Given the concentrated 30% acid content, leaving it on longer than 1 minute may cause irritation.

Q. Is tingling normal?
A. Yes, a tingling sensation may occur during application given the high acid concentration.

Q. Can I use it every day?
A. No, we recommend once a week.

Q. Can I use it during the day?
A. We recommend evening use, and sunscreen is essential after use.

Q. Who is this best for?
A. Skin dealing with rough, bumpy texture and blackheads

Q. Is there anyone who should skip this one?
A. If you're new to exfoliants or have sensitive skin, we strongly recommend a patch test first and starting with a shorter application time.