Isntree Hyper Acid 4 AHA/BHA/PHA/LHA 30 Serum
Quick take: High-strength resurfacing serum blending AHA, BHA, PHA, and LHA to smooth texture, clear pores, and brighten dullness—best for experienced acid users.
Last updated: 2024-05-20 • Changelog: Added usage order, safety, FAQ.
What it is
A multi-acid exfoliating serum designed to remove dead skin cells, unclog pores, and refine texture with a balanced mix of surface and lipid-soluble acids.
Who it's for
- Experienced acid users targeting rough texture, congestion, and uneven tone.
- Oily or combination skin; dry/sensitive types should introduce slowly and buffer with moisturizer.
- Not ideal for very sensitive, compromised, or post-procedure skin.
Key ingredients (INCI)
- Glycolic/Lactic Acids (AHA) — surface exfoliation for smoother, brighter-looking skin.
- Salicylic Acid (BHA) — oil-soluble exfoliant to decongest pores.
- Gluconolactone (PHA) — gentle exfoliation with humectant properties.
- Lipo-Hydroxy Acid (LHA) — slow-penetrating derivative for targeted pore care.
- Soothing humectants (e.g., panthenol, hyaluronate) — hydration to buffer dryness.
Free-from / texture
- Lightweight watery serum; absorbs quickly.
- Alcohol-free; check full INCI for fragrance or botanical sensitivities.
- Leaves a slightly tacky-to-drydown finish; layer moisturizer after.
How to use & order
- Use at night on clean, dry skin; avoid eye and lip areas.
- Start 1-2 times per week; increase to 2-3 times as tolerated.
- Follow with a gentle moisturizer; apply broad-spectrum SPF 30+ every morning.
Conflicts & layering tips
- Do not combine in the same routine with retinoids, other strong acids, benzoyl peroxide, or potent vitamin C to minimize irritation.
- If dryness occurs, buffer by applying over a hydrating toner/essence or follow quickly with moisturizer.
- Skip exfoliation 2-3 days before/after waxing or other procedures; avoid on compromised skin.
Evidence & notes
- AHA/BHA/PHA/LHA are established exfoliants for texture and pore care; benefits accrue over weeks.
- Mild tingling can be normal; stinging or redness persisting beyond a few minutes indicates overuse—reduce frequency.
- Sunscreen is essential; exfoliants can increase photosensitivity.
Safety
- For external use only; stop use if burning, swelling, or prolonged redness occurs.
- Patch test before full-face use, especially if you have sensitive skin.
- Avoid broken or freshly shaved skin; consult a professional for post-procedure use.
- Not advised for pregnancy/breastfeeding without clinician guidance due to salicylic acid content.
FAQ
Q. Is this serum okay for sensitive skin?
A. It is a high-strength acid blend; patch test and start once weekly. If you are very sensitive, consider a gentler exfoliant first.
Q. Can I use it with retinoids or vitamin C?
A. Avoid combining in the same routine with retinoids or strong vitamin C; alternate nights to reduce irritation risk.
Q. How should I layer it?
A. Cleanser → hydrating toner (optional) → this serum on dry skin → moisturizer → sunscreen (AM).
Licensing
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