AHA/BHA/PHA Korean Exfoliants: Complete Ingredient & Product Guide

Chemical exfoliation is a fundamental step in Korean skincare philosophy, and Korean brands have refined acid-based exfoliation into a science. Understanding the different acid types, their concentrations, and how Korean formulations differ from Western counterparts is essential for wholesale buyers building an exfoliant product category.

AHA (Alpha Hydroxy Acids)

AHAs are water-soluble acids that work on the skin surface to dissolve the bonds between dead skin cells.

Common AHAs in Korean Products

Glycolic Acid

• Source: Sugar cane
• Molecular size: Smallest AHA, deepest penetration
• Effective concentration: 5-10% in leave-on products, 20-30% in professional peels
• Korean usage: Often at lower concentrations (5-8%) combined with hydrating ingredients to reduce irritation
• Best for: Dull skin, hyperpigmentation, anti-aging

Lactic Acid

• Source: Milk (or synthetic fermentation)
• Molecular size: Larger than glycolic, gentler penetration
• Effective concentration: 5-10% in leave-on products
• Korean usage: Preferred for sensitive skin formulations, often combined with fermented ingredients
• Best for: Dry skin types, gentle exfoliation, hydration

Mandelic Acid

• Source: Bitter almonds
• Molecular size: Largest common AHA, most gentle
• Effective concentration: 5-10% in leave-on products
• Korean usage: Growing in popularity for sensitive skin and anti-acne formulations
• Best for: Sensitive skin, acne-prone skin, melanin-rich skin tones

Korean AHA Innovations

• Fermented AHA blends: Korean brands use fermentation to create complex acid mixtures that exfoliate more evenly
• Low-concentration daily use: Rather than aggressive weekly peels, Korean AHAs are formulated for gentle daily exfoliation
• Buffered formulations: AHAs combined with soothing ingredients (panthenol, Centella) for minimal irritation
• pH-optimized: Korean brands typically maintain pH 3.5-4.0 for effective exfoliation without over-irritation

BHA (Beta Hydroxy Acid)

BHA (primarily salicylic acid) is oil-soluble, allowing it to penetrate into pores for deeper cleaning.

Salicylic Acid in Korean Products

• Effective concentration: 0.5-2% in leave-on products
• pH requirement: Below 4.0 for effective exfoliation
• Korean regulatory note: Korean MFDS restricts salicylic acid to 0.5% in leave-on products (lower than the 2% allowed in the US)
• Korean alternative: Many Korean brands use betaine salicylate (a gentler derivative) instead of pure salicylic acid

Betaine Salicylate

This Korean-popularized BHA alternative deserves special attention:

• What it is: A salt of salicylic acid combined with betaine (a sugar beet derivative)
• Advantage: Gentler than pure salicylic acid while maintaining pore-clearing efficacy
• Concentration: Typically used at 4% (equivalent in efficacy to approximately 0.5-1% salicylic acid)
• Consumer appeal: "Gentle BHA" messaging resonates strongly
• Wholesale note: Products with betaine salicylate may navigate regulatory restrictions more easily in markets with low salicylic acid limits

Willow Bark Extract

Another BHA-adjacent ingredient common in Korean products:

• Contains natural salicin (a salicylic acid precursor)
• Gentler and less predictable than synthetic BHA
• Popular in "natural" or "clean beauty" formulations
• Not a direct replacement for salicylic acid in efficacy

PHA (Polyhydroxy Acids)

PHAs represent Korea's most significant contribution to the acid exfoliation category. These larger-molecule acids provide exfoliation with significantly less irritation.

Common PHAs

Gluconolactone

• Source: Gluconic acid derivative
• Molecular size: Much larger than AHAs, cannot penetrate as deeply
• Effective concentration: 5-15%
• Unique benefit: Antioxidant properties alongside exfoliation
• Best for: Sensitive skin, rosacea-prone skin, beginners

Lactobionic Acid

• Source: Lactose derivative
• Molecular size: Very large molecule
• Effective concentration: 5-10%
• Unique benefit: Potent humectant, chelates iron (reduces free radical damage)
• Best for: Aging skin, dry skin, post-procedure recovery

Why PHAs Are a Wholesale Opportunity

PHAs solve the biggest problem with chemical exfoliation: many consumers are afraid of acids. PHAs offer:

• No stinging or burning at effective concentrations
• Suitable for sensitive skin (including rosacea-prone)
• Compatible with retinol (can be used in the same routine without overexfoliation)
• Humectant properties (hydrate while exfoliating)
• Photosensitivity-free (unlike AHAs, PHAs do not increase sun sensitivity)

Marketing angle: "Acid exfoliation for people who are afraid of acids" is a powerful selling proposition.

Korean Exfoliant Product Formats

Exfoliating Toners

The most popular Korean exfoliant format:

• Typical acid concentration: 0.5-5% mixed acids
• Usage frequency: Daily or every other day
• Application: Cotton pad swipe or pat into skin
• Wholesale price: USD 3-6 per unit
• Retail price: USD 10-22
• Volume: Typically 150-250ml (lasts 2-3 months)

Exfoliating Pads

Pre-soaked cotton pads with exfoliating solution. One of the most viral K-Beauty formats.

• Typical contents: 60-80 pads per jar
• Acid concentration: 1-5% mixed acids
• Usage: 1-2 pads per use, daily or every other day
• Wholesale price: USD 4-8 per unit
• Retail price: USD 12-28
• Consumer appeal: Convenient, mess-free, satisfying to use

Exfoliating Serums

Higher concentration treatments for targeted results:

• Typical acid concentration: 5-15%
• Usage frequency: 2-3 times per week
• Wholesale price: USD 5-10 per unit
• Retail price: USD 15-35
• Best for: Experienced acid users, specific concern treatment

Peeling Gels

Physical-chemical hybrid exfoliants unique to Korean skincare:

• How they work: Gel applied to dry skin, rolled with fingers to create "dead skin" balls (combination of product cellulose and actual dead skin cells)
• Acid content: Usually mild (1-3%) supplemented by physical rolling action
• Consumer appeal: Extremely satisfying visible results, gentle enough for daily use
• Wholesale price: USD 3-6 per unit
• Retail price: USD 8-18
• Note: Very popular in Asia, growing in Western markets

Concentration and pH Guide for Buyers

Understanding effective acid parameters helps you evaluate product quality:

Acid Type	Minimum Effective Concentration	Optimal pH Range	Max Daily Use
Glycolic Acid	5%	3.0-4.0	10%
Lactic Acid	5%	3.5-4.0	10%
Mandelic Acid	5%	3.5-4.5	10%
Salicylic Acid	0.5%	3.0-4.0	2%
Betaine Salicylate	4%	3.5-4.5	5%
Gluconolactone	5%	3.5-4.5	15%
Lactobionic Acid	5%	3.5-4.5	10%

Buyer tip: Request pH testing data from suppliers. An exfoliant with the right acid concentration but wrong pH will not work effectively.

Building an Exfoliant Category

Essential (4-6 SKUs)

• 1 AHA exfoliating toner (daily gentle exfoliation)
• 1 BHA exfoliating product (pore-targeting)
• 1 PHA product (sensitive skin option)
• 1 exfoliating pad set (convenience format)
• Optional: 1 peeling gel (viral potential)

Advanced (10+ SKUs)

• Add: Multiple brands at different price points
• Add: Higher concentration serums for experienced users
• Add: Combination AHA/BHA/PHA products
• Add: Body exfoliants (growing category)

Source Korean exfoliant products from brands on knokglobal.com and request formulation details including acid types, concentrations, and pH levels to ensure you are stocking effective, well-formulated products.