How can stretch marks be reduced according to scientific evidence?

Stretch marks affect the vast majority of people, often after pregnancy, a growth spurt, or weight fluctuations. And a persistent mythology revolves around them: the miracle oil that makes them disappear, the cream that prevents them for sure. The scientific reality is more nuanced, but also more useful to know.

Understanding what a stretch mark actually is, and what stage it's at, changes everything: it determines what can work and what will only moisturize you. Let's take stock, without promises.

A stretch mark is not surface dirt: it's a scar in the dermis. This radically changes what can be expected from it.

What really happens in the skin

A stretch mark, or striae distensae, results from a rupture of the dermis: stretching and hormonal factors disorganize the collagen and elastin framework, and the extracellular matrix weakens. Two stages are distinguished. Striae rubra are recent, red or purplish stretch marks: the dermis is still inflammatory and edematous, and this is precisely what makes them amenable to treatment. Striae alba are old, white, and pearly stretch marks: the epidermis has thinned and atrophied, and it is then a mature scar, much more difficult to modify.

Tretinoin, the most solid evidence

For recent stretch marks, the most well-established data concerns topical tretinoin. A randomized, double-blind, placebo-controlled trial showed that 0.1% tretinoin applied daily for several months significantly improved the clinical appearance of early stretch marks, while control areas continued to expand. The key word is early: the effect exists on striae rubra, not on striae alba.

One major caveat, however: tretinoin is contraindicated during pregnancy. Yet red stretch marks often appear precisely at that time. Hence a delicate timing issue, which justifies talking to a dermatologist to decide the right time, after childbirth and outside of breastfeeding.

Centella, lasers: what is of interest

In terms of prevention, centella asiatica is the active ingredient best supported by data. A randomized controlled trial showed that a cream combining centella triterpenes, vitamin E, and collagen-elastin hydrolysates, applied during pregnancy, reduced the incidence of stretch marks compared to placebo. The effect exists but remains modest.

For established stretch marks, dermatological techniques offer the best results: fractional lasers, intense pulsed light, microneedling, sometimes in combination. None completely erase a stretch mark, but they can significantly improve its appearance. These are medical procedures, to be entrusted to a professional.

Demystifying miracle oils

This is probably the most important point. A Cochrane review of six trials and eight hundred women concluded that no tested topical preparation demonstrably prevented the appearance of stretch marks during pregnancy, nor reliably reduced their severity. Cocoa butter and olive oil, in particular, have not proven their preventive efficacy. This does not mean that these oils are useless: they moisturize, soften, and make massage pleasant. But they should be seen for what they are, comfort care, and not as an anti-stretch mark shield.

Hydration and prevention, in their right place

While no cream guarantees the absence of stretch marks, maintaining supple and well-hydrated skin remains common sense, and regular massage of at-risk areas has shown a modest but real benefit. However, uncontrollable factors—genetics, the extent and speed of stretching, hormonal background—remain major. A clear expectation is better than a disappointed promise: we moisturize because it's pleasant and good for the skin, not because we expect a miracle.

The Paradermia approach

Our position as pharmacists is to tell things as they are: recent striae rubra is a real window of action, old striae alba mostly requires dermatological procedures, and no oil makes a stretch mark disappear. We prefer to guide you towards what has evidence—tretinoin at the right time and outside of pregnancy, centella for prevention, lasers for established marks—rather than selling dreams. Hydration has its place, provided it is understood for what it is: comfort, not a cure.

Frequent questions

Can stretch marks completely disappear?
No. A stretch mark is a scar in the dermis; its appearance can be significantly improved, especially at the recent red stage, but no current method completely erases it. Old white stretch marks are the most difficult to modify.

Are anti-stretch mark oils really useful?
They moisturize and soften the skin, which is pleasant, but no topical preparation has reliably prevented the appearance of stretch marks during pregnancy. See them as comfort care.

Can I use tretinoin on my stretch marks during pregnancy?
No, tretinoin is contraindicated during pregnancy. This is the whole point of timing: this treatment is considered after childbirth and outside of breastfeeding, on still red stretch marks, and always with medical advice.