Skin Atlas
Definition & Application
An archive of mapped terms.
Classified within the context of modern skincare.
Organic Acids: Effects, Types, and Application for the Skin
Organic acids are among the most effective active ingredient groups in modern skincare. They promote cell renewal, remove dead skin cells, and support the natural acid mantle – with varying depths of action and areas of application depending on the type.
TABLE OF CONTENTS
What are organic acids?
In skincare, the term organic acids primarily encompasses fruit acids such as lactic acid or glycolic acid. A distinction is made between Alpha-Hydroxy-Acids (AHAs), Beta-Hydroxy-Acids (BHAs), and Poly-Hydroxy-Acids (PHAs) – according to La Roche-Posay, one of the most well-researched groups of active ingredients in modern dermatology.
How do organic acids work?
Organic acids specifically lower the pH value on the skin's surface, thereby dissolving the bonds between dead skin cells. This chemical exfoliation process smooths the skin's surface and improves the absorption of subsequently applied active ingredients. At the same time, regular application can strengthen the skin barrier in the long term – contrary to the widespread prejudice that acids damage the skin, as NetDoktor explains.
Organic acids do not damage the skin – with proper use, they can strengthen the barrier in the long term.
AHA, BHA, and PHA in comparison
Regular use of organic acids can visibly improve the complexion: the surface appears smoother, pigment spots look lighter, and the skin better absorbs subsequent skincare products. The depth of action and area of application differ depending on the type of acid:
- AHAs (Alpha-Hydroxy-Acids): These include glycolic acid and lactic acid. They are water-soluble, primarily act on the skin's surface, and are particularly suitable for normal to dry skin.
- BHAs (Beta-Hydroxy-Acids): Salicylic acid is the best-known representative – fat-soluble and able to penetrate deep into the pores. Particularly effective for blemished or oily skin, as described by La Roche-Posay.
- PHAs (Poly-Hydroxy-Acids): Larger molecules with a milder effect – ideal for sensitive skin types who want to benefit from exfoliation without risking irritation.
Application and tolerability
Products with organic acids are ideally applied in the evening after cleansing. Since the skin becomes more sensitive to light after acid treatment, daily sun protection with SPF 30 or higher is absolutely essential, as NetDoktor emphasizes. Newly introduced acids should be tested gradually – starting with 1–2 applications per week to check tolerability and avoid irritation.
Combination with other active ingredients
Organic acids can be well combined with moisturizing active ingredients such as hyaluronic acid or glycerin – these balance the exfoliating effect and prevent dehydration. Simultaneous use with highly potent ingredients like retinol or highly concentrated vitamin C is less recommended, as this can excessively irritate the skin. A temporal separation – for example, acids in the evening, vitamin C in the morning – is sensible here.
Suitable for which skin types?
Basically, most skin types can benefit from organic acids – the right choice is crucial: AHAs are suitable for dry or mature skin, BHAs for oily and blemished skin, PHAs for sensitive skin. In cases of active skin inflammation, open wounds, or rosacea, acid applications should be avoided or a dermatologist should be consulted beforehand.
Frequently asked questions about organic acids
How often should organic acids be used?
For beginners, application 1–2 times a week is recommended. Depending on tolerability, the frequency can be gradually increased to 3–4 times a week. Daily use is only advisable for very low-concentrated formulas and skin already accustomed to acids.
Are organic acids compatible with sensitive skin?
Yes – with the right choice: PHAs have larger molecules and are milder than AHAs or BHAs. They penetrate less deeply into the skin and cause less irritation, making them particularly suitable for sensitive skin types.
Why is sun protection so important after using organic acids?
Organic acids exfoliate the skin's surface, making the newly exposed skin more sensitive to UV radiation. Without adequate sun protection, the risk of pigment spots and sun damage increases. SPF 30 or higher is recommended after every acid application.
Conclusion
Organic acids are versatile active ingredients that can promote skin renewal, reduce pigment irregularities, and sustainably improve the complexion. The right choice of acid type – AHA, BHA, or PHA – depends on the skin type and the desired effect. With gentle introduction and consistent sun protection, organic acids are an effective component of any well-founded skincare strategy.
References
- La Roche-Posay (2025): Fruit acid peeling for acne
- NetDoktor (2021 rev. 2024): Fruit acid peeling – how it works
