Glycolic acid can improve the appearance of stretch marks, but it works best when combined with other active ingredients rather than used alone. The most studied combination pairs 20% glycolic acid with 0.05% tretinoin, which has been shown to increase elastin content in the skin and reduce the width of mature, white stretch marks. On its own, glycolic acid offers modest benefits by boosting collagen production and speeding up skin cell turnover, but it is not a standalone solution for significant fading.
How Glycolic Acid Affects Stretch Mark Skin
Stretch marks are a form of scarring where the middle layer of skin (the dermis) has been stretched beyond its elastic limit, causing collagen and elastin fibers to break apart. The result is a thin, discolored band of tissue with a different texture from the surrounding skin. Glycolic acid targets this damage through two mechanisms: it increases collagen production in skin cells at concentrations below 0.1%, and it inhibits enzymes (called MMPs) that break down existing collagen. In other words, it helps your skin build new structural protein while also slowing the destruction of what’s already there.
Because glycolic acid is the smallest alpha-hydroxy acid, it penetrates skin more easily than larger chemical exfoliants. On the surface, it dissolves the bonds between dead skin cells, which smooths texture and can make shallow stretch marks less noticeable. Deeper in the skin, it stimulates fibroblasts, the cells responsible for producing collagen and elastin. This dual action, surface exfoliation plus deeper remodeling, is what makes it a reasonable ingredient for stretch mark care, even if the results are subtle compared to in-office procedures like laser therapy or microneedling.
Red vs. White Stretch Marks: When It Helps Most
Stretch marks go through two distinct phases, and the timing of treatment matters. Early stretch marks (striae rubra) are pink, red, or purple. They’re still actively forming, with ongoing inflammation and blood vessel activity in the damaged tissue. This is the window when topical treatments, including glycolic acid, have the most impact because the skin is still remodeling itself.
Older, mature stretch marks (striae alba) are white or silver and have essentially stopped changing on their own. The collagen in these marks has already reorganized into scar tissue, making them harder to treat with any topical product. That said, research on women aged 23 to 49 with white stretch marks found that 20% glycolic acid combined with either tretinoin or vitamin C improved the appearance of these older marks. Both combinations performed similarly, with no significant statistical difference between them. So while white stretch marks are more stubborn, glycolic acid-based treatments can still make a visible difference.
The Combination That Works Best
The strongest clinical evidence supports pairing glycolic acid with tretinoin (a prescription-strength retinoid). A formulation of 20% glycolic acid with 0.05% tretinoin increased elastin content in both the upper and deeper layers of the dermis, based on tissue biopsies taken before and after treatment. Patients in these studies reported subjective improvement in both the appearance of their stretch marks and the overall quality of the treated skin. The combination also reduced the width of white stretch marks.
This pairing works because the two ingredients complement each other. Glycolic acid exfoliates and boosts collagen, while tretinoin accelerates skin cell turnover and has its own well-documented ability to stimulate collagen synthesis. Together, they remodel stretch mark tissue more effectively than either ingredient alone. Some dermatology reviews have gone as far as calling glycolic acid plus tretinoin the only topical combination with demonstrated clinical significance for treating mature stretch marks.
A second option pairs 20% glycolic acid with 10% vitamin C (L-ascorbic acid). Vitamin C is essential for collagen formation and also provides antioxidant protection. In head-to-head comparisons with the tretinoin combination, the vitamin C pairing produced similar improvements. This is a useful alternative if you can’t use tretinoin, such as during pregnancy or breastfeeding, when retinoids are off-limits.
What Concentration to Use
The clinical studies showing improvement in stretch marks used 20% glycolic acid, which is higher than what most over-the-counter products contain. Drugstore serums and lotions typically range from 5% to 12%. These lower concentrations still exfoliate and can mildly stimulate collagen, but you should expect slower, more subtle results than what the research describes.
Professional chemical peels use glycolic acid at concentrations up to 70%, and these can be applied to the body as well as the face. A series of professional peels targets deeper layers of the skin and may produce more noticeable texture improvement in stretch marks. Mild peel formulations are also available for home use, though they generally cap out around 30% and require careful patch testing before applying to larger areas of the body.
If you’re starting with an over-the-counter product, begin at a lower concentration and use it every other day to gauge your skin’s tolerance before increasing frequency. The skin on your abdomen, thighs, and hips (where stretch marks most commonly appear) is often more sensitive than facial skin, and irritation can lead to darkening of the surrounding area, especially on medium to deep skin tones.
Skin Tone Considerations
Glycolic acid increases your skin’s sensitivity to UV light and can trigger post-inflammatory hyperpigmentation, where the treated area darkens rather than fading. This risk is higher in people with darker skin (generally Fitzpatrick skin types IV through VI). If you have a medium, olive, or deep complexion, start with a lower concentration, use the product at night, and apply sunscreen to any treated areas that will be exposed to sunlight. Professional peels carry a higher hyperpigmentation risk than daily-use products, so discuss your skin type with a dermatologist before going that route.
Realistic Expectations
No topical product will erase stretch marks completely. The structural damage extends deep into the dermis, and creams and peels primarily affect the upper layers of skin. What glycolic acid can do, particularly in combination with tretinoin or vitamin C, is improve the texture, reduce the width, and soften the contrast between stretch marks and the surrounding skin. Over several months of consistent use, these incremental changes can make stretch marks noticeably less prominent, even if they don’t disappear entirely.
Topical treatments require patience. Most clinical studies evaluate results after 12 weeks or more of regular application. You likely won’t see meaningful changes in the first few weeks, so consistency matters more than concentration. If you want faster or more dramatic results, in-office options like fractional laser therapy or microneedling can be combined with topical glycolic acid for a more comprehensive approach. But as a low-cost, accessible starting point, glycolic acid paired with a complementary active ingredient is one of the better-supported topical strategies available.