Good Genes uses lactic acid. COSRX AHA 7 uses glycolic acid. That is a job match, not a dupe.
Sunday Riley Good Genes Lactic Acid Treatment is a leave-on exfoliating treatment built around purified lactic acid, licorice and a richer supporting formula. COSRX AHA 7 is a Korean liquid with 7% glycolic acid. Both address dullness and uneven texture, but the acid, vehicle and published formula are different.
What Good Genes actually is
| Product | Sunday Riley Good Genes Lactic Acid Treatment |
|---|---|
| Format | Leave-on lactic-acid treatment / serum |
| Standard size | 1 fl oz / 30 ml |
| Brand price | $85 on the US product page |
| Published formula signal | Purified lactic acid with licorice, botanical extracts, squalane and emollients; the current page does not publish a lactic-acid percentage |
| Availability checked | Official page showed out of stock on 25 August 2026 |
Good Genes is not just an “AHA serum” in the abstract. Sunday Riley names lactic acid as the exfoliating ingredient and describes the product as a treatment for the look of dullness, uneven tone and texture. The current official page also lists licorice, prickly pear, aloe, arnica, squalane and a silicone-and-emollient base. Because the brand does not publish a percentage on that page, we do not invent one from the phrase “high potency.”
Closest Korean job match: COSRX AHA 7
COSRX AHA 7 Whitehead Power Liquid
COSRX publishes a simpler and more measurable exfoliating brief: 7% glycolic acid in a 100 ml liquid. Its official INCI starts with apple fruit water and butylene glycol, followed by glycolic acid, niacinamide, panthenol and sodium hyaluronate. The list does not name lactic acid.
This makes COSRX a same-category, different-molecule job match. It is a relevant answer for someone searching for a lower-price Korean product for surface exfoliation, rough texture or whiteheads. It is not evidence that glycolic acid at 7% equals Good Genes, because Good Genes' lactic-acid percentage is not published here and the vehicles are different.
The COSRX US page listed a $22 regular price and showed no immediate stock when checked; a temporary $11 sale was also displayed in that snapshot. COSRX's official stores page lists YesStyle as an international authorized seller. The YesStyle US storefront showed 100 ml at about $17.60 on sale and in stock when checked, making it the practical purchase path to verify for country-specific shipping and price. Prices, promotions, shipping and eligibility move.
COSRX AHA 7 on COSRX COSRX AHA 7 on YesStyle
Side by side
| Good Genes | COSRX AHA 7 | |
|---|---|---|
| Lead acid | Lactic acid | Glycolic acid at 7% |
| Supporting formula | Licorice, botanical extracts, squalane, silicones and emollients | Apple fruit water, butylene glycol, niacinamide, panthenol and sodium hyaluronate |
| Format | Serum-like leave-on treatment | Water-based liquid exfoliant |
| Formula match? | Original | No — different AHA, vehicle and ingredient list |
| Job match? | Original exfoliation / brightening step | Yes — same broad exfoliation and texture job |
| Price checked | 30 ml / $85 brand US | 100 ml / $22 list price brand US; YesStyle snapshot about $17.60 sale and in stock |
What “Korean alternative” does not prove
“AHA” is a family label, not a promise of identical performance. Lactic acid and glycolic acid are different acids; the concentration, pH, supporting ingredients and texture also shape how a product fits a routine. We therefore use job match for COSRX and reserve formula match for a materially closer ingredient-and-form comparison.
COSRX's official page advises introducing AHA 7 gradually and avoiding casual combinations with other acids, retinoids or vitamin C. Follow the product label, use sunscreen as directed, and stop if your skin reacts. This page is product comparison, not medical advice.
Related exfoliation comparisons
Different acids can serve a similar routine step without being interchangeable:
- Drunk Elephant Framboos Korean alternatives — a multi-acid serum with a different strength and vehicle.
- Paula’s Choice 2% BHA vs Korean BHA options — salicylic acid versus other BHA forms.
Sources
- Sunday Riley official Good Genes page: product identity, $85 price, 30 ml size, lactic-acid positioning, supporting formula details and out-of-stock snapshot, checked 25 August 2026.
- COSRX official AHA 7 page: 7% glycolic acid, 100 ml size, full listed INCI, $22 list price, temporary sale and no-immediate-stock snapshot, checked 25 August 2026.
- COSRX official stores page: YesStyle listed as an international authorized seller, checked 25 August 2026.
- YesStyle COSRX AHA 7 listing: 100 ml, approximately $17.60 sale / $22 list and in-stock US storefront snapshot; price, stock, shipping and country eligibility move, checked 25 August 2026.
- Picky Good Genes dupe discussion: directional evidence of ongoing alternative/dupe interest around Sunday Riley Good Genes; it is user discussion, not proof of Korean relevance, current search volume or product equivalence, checked 26 August 2026.