Sunday Riley Good Genes Dupe: You're Paying $112 for the Base, Not the Acid

The Ordinary Lactic Acid 10% + HA, at about $10, uses the same active acid as Sunday Riley Good Genes (~$122) — at a higher disclosed concentration, since Good Genes has never published its lactic acid percentage. Call it a partial dupe: the $112 gap buys Good Genes' base formula and finish, not a stronger acid. One caveat before you swap: Sunday Riley makes both lactic and glycolic versions, so make sure you're comparing the right one.

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Sunday Riley Good Genes is one of the most-copied products in skincare. And the most-cited dupe is a $10 bottle from The Ordinary that uses the same acid at a higher disclosed concentration. But before you swap, two things are worth knowing: Good Genes has never published its lactic acid percentage (so every comparison relies on estimates), and Sunday Riley actually makes two versions of Good Genes — a lactic acid treatment and a glycolic acid treatment — and you need to make sure you're comparing the right one.

We pulled both ingredient lists. Here's the honest breakdown.

Good Genes vs. The Ordinary: How Do They Compare Side-by-Side?

A few things stand out. Good Genes' estimated range (5–7%) is community inference — Sunday Riley has never confirmed a number, so this comparison is an active-class match, not a confirmed concentration match. The Ordinary discloses 10% on the label. At roughly $2.44 per ml (Good Genes) versus $0.33 per ml (The Ordinary), you're looking at a 7x price-per-ml gap before you've even considered what each base does. And note the bottom row: the glycolic version of Good Genes uses a different acid entirely, making it a separate comparison target. For this post, we're focused on the lactic acid duel.

Same Molecule. Not the Same Formula.

Lactic acid is lactic acid. Both products use it as their core active — an alpha hydroxy acid (AHA) that exfoliates the skin's surface, accelerates cell turnover, and gradually improves tone and texture. The Ordinary Lactic Acid 10% + HA states its concentration clearly; Sunday Riley does not. Ingredient-analysis communities and cosmetic chemists who have tested Good Genes estimate the lactic acid concentration sits somewhere in the 5–7% range, but that estimate has never been verified by Sunday Riley. So when people say 'The Ordinary has more acid than Good Genes,' they're right about The Ordinary's disclosed number and working from inference on Good Genes' side. Worth being precise about that.

The formula gap is real, though. Good Genes includes squalane, lemongrass oil, and licorice root extract alongside the acid. Those aren't decorative. Squalane is a legitimately effective emollient that supports the skin barrier. Licorice root extract has evidence for brightening and calming. And lemongrass oil contributes the signature Good Genes scent that a lot of people find genuinely pleasant. None of those ingredients make the lactic acid work harder. But they do make the formula feel like something you'd want to put on your face.

The Ordinary's formula is minimal by design: lactic acid, two weights of hyaluronic acid, a short supporting list. Clinical. It does the job without ceremony. Some people find the slight tackiness off-putting; most get used to it. But if you care about the sensory experience of your skincare routine, the difference between these two products is real and noticeable.

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What You're Actually Paying $112 More For

Not a stronger acid. That's the main thing. Based on what's disclosed (and what the community has estimated), The Ordinary's lactic acid concentration is at least equal to Good Genes' — and likely higher. What the premium buys is the base formulation, the sensory experience, and the brand. We've run a similar comparison on the SkinCeuticals C E Ferulic dupe question, where the active-class match is messier. Here, the active match is cleaner. The gap is almost entirely in the delivery vehicle.

One thing we think gets underweighted in dupe conversations: consistency matters more than the exact formula. According to the American Academy of Dermatology, most AHA benefits (improved texture, reduced hyperpigmentation, fine line softening) require consistent use over 4–12 weeks — the results don't come from a single application. If the Good Genes formula is the one you'll actually use three times a week for three months, that's worth something. But if you're disciplined either way, The Ordinary gets you to the same destination.

Two Versions of Good Genes — Make Sure You're Comparing the Right One

Sunday Riley sells a Good Genes Lactic Acid Treatment and a Good Genes Glycolic Acid Treatment. The lactic version is the one most widely available in the US and the one this post addresses. The glycolic version is more common in EU/UK markets (where lactic acid at certain concentrations has faced regulatory constraints). Glycolic acid and lactic acid are both AHAs and work similarly, but glycolic has a smaller molecular size — meaning it penetrates more readily, which makes it both more effective and more likely to irritate sensitive skin. The Ordinary Lactic Acid 10% + HA does not dupe the glycolic version. These are different active molecules.

AHA Safety — Non-Optional

Both products use an AHA. AHAs increase photosensitivity — that's documented by the FDA, not just beauty folklore. Daily SPF is non-negotiable while using either formula. Skip it and you're actively undoing the exfoliation work by exposing newly-turned-over skin to UV damage without protection. If you need a sunscreen that layers well with active serums, our EltaMD UV Clear dupe guide covers the options.

Patch test first. Especially if you haven't used chemical exfoliants before. And don't layer either of these with other AHAs, BHAs, or retinoids in the same routine until you know how your skin responds — that kind of stacking causes irritation that people misread as the product being 'too strong' when it's actually a routine problem, not a product problem.

Our Recommendation

We'd recommend The Ordinary Lactic Acid 10% + HA for most people. Same active. Higher disclosed concentration. $112 cheaper. The results from lactic acid — brighter skin tone, smoother texture, reduced hyperpigmentation — come from the acid, not the squalane base around it. Start with The Ordinary. If after a full tube you love the results but find the clinical texture hard to stick with, then Sunday Riley Good Genes Lactic Acid Treatment earns a trial.

New to lactic acid? Start with The Ordinary Lactic Acid 5% + HA instead (roughly $7, as of this writing). The research on optimal AHA concentration for long-term use across different skin types is honestly still thin — we're not sure the 10% is meaningfully better for everyone, and starting lower gives you a cleaner read on how your skin adapts.

The Verdict: Partial Dupe

The Ordinary Lactic Acid 10% + HA is the strongest lactic acid dupe for Sunday Riley Good Genes on the market. Same active molecule. Higher disclosed concentration (versus a number Sunday Riley has never confirmed). Same exfoliation mechanism. But not the same formula — Good Genes' squalane-and-botanical base is meaningfully different, and some people will prefer it. This is a partial dupe: same active class, different delivery. For anyone primarily motivated by results per dollar, The Ordinary wins. For anyone who finds the luxury-base formula actually keeps them consistent, the Good Genes premium might be justified.

One thing worth saying plainly: the 5–7% estimate for Good Genes' lactic acid percentage is community inference. Sunday Riley has never confirmed a number. If they ever do, and it changes this comparison, we'll update this post. Until then, we can confirm: same acid family, The Ordinary discloses a higher concentration, and you're paying $112 more for a richer base and a brand.

If you spend more time than you'd like doing this kind of ingredient-list detective work, we're building a tool that reads any product's ingredient list and instantly flags whether a cheaper option shares the same actives — or just the same base. Join the dupe finder waitlist and we'll let you know when it's live.

And if color-aware skincare (matching your routine to your skin's seasonal undertones) is something you're curious about, our free color season quiz is a good place to start — the undertone work translates directly into smarter product choices, including actives.

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Frequently Asked Questions

Is The Ordinary Lactic Acid a good dupe for Sunday Riley Good Genes?

Yes, with one important caveat: it's an active-class match, not a confirmed concentration match. The Ordinary Lactic Acid 10% + HA (~$10) uses the same active ingredient — lactic acid — as Sunday Riley Good Genes Lactic Acid Treatment (~$122), at a higher disclosed concentration. Good Genes has never published its lactic acid percentage. The formulas differ in their base: Good Genes uses squalane and botanicals for a richer feel. For the active benefit — exfoliation, texture, brightening — The Ordinary is a strong match.

What percentage lactic acid is in Sunday Riley Good Genes?

Sunday Riley has not publicly disclosed the lactic acid percentage in Good Genes. Community estimates and ingredient analysis suggest it falls around 5–7%, but that's inference, not confirmed data. The Ordinary Lactic Acid 10% discloses its concentration clearly on the label, which means The Ordinary's disclosed concentration is higher than Good Genes' estimated range.

Are there two versions of Sunday Riley Good Genes?

Yes. Sunday Riley makes a Good Genes Lactic Acid Treatment (most widely available in the US) and a Good Genes Glycolic Acid Treatment (more common in EU/UK markets). They use different acids — lactic versus glycolic — and are not interchangeable as dupe targets. The Ordinary Lactic Acid 10% dupes the lactic acid version only. Make sure you're comparing the right one before buying.

Can I use The Ordinary Lactic Acid every day?

Most people start with 2–3 times per week and build from there once their skin adapts. AHAs increase photosensitivity regardless of how often you use them — daily SPF is mandatory throughout. Don't layer lactic acid with other AHAs, BHAs, or retinoids in the same routine until you know how your skin responds, as stacking often causes irritation that gets misattributed to the product being too strong.

Should I start with The Ordinary Lactic Acid 5% or 10%?

New to chemical exfoliants or prone to sensitivity? Start with The Ordinary Lactic Acid 5% + HA (~$7). It delivers the same active at a gentler entry point. After 4–6 weeks of consistent use without irritation, you can step up to the 10% if you want stronger results. Both versions are well-tolerated by most skin types when used correctly with daily SPF.