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The Gentle Acid

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AHA + PHA Exfoliating Acid Toner

A powerful yet gentle, hydrating exfoliating toner that leaves your skin looking smooth, radiant and even. Suitable for all skin types.
Caroline Says

Caroline Hirons says

The ultimate glow-giver, this acid toner is appropriate for all skin types. The formula contains a combination of exfoliating AHAs, a PHA and antioxidant-rich tropical fruit extracts – leaving your skin gorgeously radiant.

Skin types and skin tones

Skin types and skin tones

Tested on and suitable for all skin types and tones.

Skin concerns

Skin concerns

Hyperpigmentation, dark spots, uneven skin tone, dullness and skin texture.

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This gentle acid toner works hard to deliver the power of exfoliation, without the irritation.

Powered by a blend of alpha-hydroxy and polyhydroxy acids (AHAs and PHA) and skin-conditioning ingredients, this next-generation exfoliating toner provides a comfortable exfoliation experience without compromising on results.

This sophisticated formula visibly evens skin tone, reduces hyperpigmentation, minimises the appearance of visible pores and refines skin texture, all whilst respecting your skin barrier.

Skin-soothing and hydration-boosting actives work in harmony with the acids to moisturise the skin, altogether revealing a hydrated, smooth and radiant complexion with minimal irritation. 

 this if:

You want to achieve brighter, smoother and more even skin with minimal irritation.

don't need
 this if:

You have oily, congested and/or breakout-prone skin – you need The Control Acid.

Mandelic acid helps to inhibit the expression of tyrosinase – the enzyme that contributes to hyperpigmentation – working with lactic acid and gluconolactone to gently buff away old cells at the surface of the skin. Skin-soothing and hydration-boosting actives ensure skin is simultaneously conditioned and well-hydrated to achieve gentle exfoliation.

Aqua (Water/Eau), Sodium Hydroxide, Mandelic Acid, Lactic Acid, Pentylene Glycol, Glycerin, Ethoxydiglycol, Gluconolactone, Spondias Mombin Pulp Extract, Mangifera Indica (Mango) Pulp Extract, Musa Sapientum (Banana) Pulp Extract, Microcitrus Australasica Fruit Extract, Panthenol, Benzyl Alcohol, PPG-26-Buteth-26, Caprylhydroxamic Acid, PEG-40 Hydrogenated Castor Oil, Trisodium Ethylenediamene Disuccinate, Potassium Sorbate.

How to use

Use in either the AM or PM, up to 3 times a week. After cleansing, dampen a cotton pad with the toner and sweep over a clean, dry face. Avoid the eye area. Follow with the rest of your routine and use sun protection during the day.

AM routine example: The Cream Cleanser, The Gentle Acid, The Moisturiser and SPF.

PM routine example: The Cream Cleanser (double cleanse), The Gentle Acid, The Support Oil and The Moisturiser.

You can use The Gentle Acid in the AM or PM (not both). However, you may wish to reserve exfoliation for the PM to avoid immediate sun exposure. Remember to always wear sun protection after using acids, as your skin’s sensitivity to sun damage can become heightened.

No, you do not need to use both acids in a single routine. Please choose the formula best suited to your skin’s needs.

Yes, our acid toners are topically applied facial cosmetic products that are safe to use during pregnancy and while breastfeeding. All Skin Rocks products are developed to fully comply with both the UK and EU Cosmetic Regulations and undergo a strict independent safety assessment before they can be sold to consumers.

This product contains alpha-hydroxy acids (AHAs) that may increase your skin's sensitivity to the sun and, particularly, the possibility of sunburn. Use sunscreen, wear protective clothing, and limit sun exposure while using this product and for a week afterwards. Use only as directed. If irritation persists, discontinue use.


The Gentle Acid is our AHA + PHA Exfoliating Acid Toner, which is suitable for all skin types. The Control Acid is our 2% Salicylic Acid + Polylysine Exfoliating Acid Toner that has been specifically developed for oily, congested and/or breakout-prone skin.

Mandelic acid: An AHA that specifically targets hyperpigmentation, helping to achieve even, glowing and more radiant skin.

Lactic acid: A skin-conditioning AHA that visibly smooths the skin, minimising the appearance of fine lines and visible pores whilst boosting hydration.

Gluconolactone: Known to be a gentle alternative to AHAs, this PHA helps to delicately exfoliate the skin whilst increasing hydration and offering antioxidant protection.

Caja, mango and banana extracts: A combination of extracts naturally rich in AHAs that work together to gently buff away old skin cells on the outermost layer of the skin.

Panthenol and glycerin: Skin-soothing ingredients that complement the acid’s exfoliating action and help to prevent irritation.

Short for alpha-hydroxy acid, AHAs are types of water-soluble exfoliating acids that help to exfoliate the surface of the skin, leaving a glowing and more even complexion. Glycolic acid is a very popular AHA in skincare, however, it can be irritating for some skins and is the only AHA proven to increase your skin’s sensitivity to the sun. Therefore, we chose to use alternative AHAs that are kinder to the skin yet still pack a punch – mandelic and lactic acids.

Polyhydroxy acids (PHAs) are water-soluble exfoliating acids with similar benefits to AHAs. PHAs are known to be gentler alternatives to AHAs due to their larger molecule size and are often recommended for sensitive skins.

The Gentle Acid contains 9% AHA (5% mandelic and 4% lactic acid) and 1% PHA (gluconolactone).

Yes, The Gentle Acid is suitable for all skin types. It has been specifically formulated to benefit those with dull, uneven skin. The Gentle Acid has been formulated to use variants of AHAs/PHA shown to have good compatibility with a wide range of skin types and tones. Whilst The Gentle Acid should be okay to use if you are prone to sensitivity, we would always recommend to patch test before first use and to discontinue use if there are any signs of irritation. You should not be using acid products on any areas of skin that are actively sensitised or if you have a known allergy to any of the ingredients used.

Yes, during development and our clinical and consumer trials, we always ensure that our testing panels are fully inclusive, representing all skin tones. Both mandelic and lactic acid were also included in the formula because of their known compatibility with all skin tones and types.

Yes, all of our products are cruelty free and The Gentle Acid is vegan-friendly. Skin Rocks do not and never will test our products or ingredients on animals. Neither will we ask or allow any third parties to do so on our behalf.

All individual components of The Gentle Acid packaging are recyclable. Separate, rinse and dry all components before recycling. Please check all materials against local requirements.

Bottle: Glass
Cap: Plastic (PP)
Reducer Plug: Plastic (PE)
Carton and leaflet: All paper and card is from a certified FSC source

No, The Gentle Acid is fragrance free.

Clinical Study and Consumer Trial Results

Clinically proven to...

Improve skin radiance.*
Increase skin brightness.*
Reduce redness.*

*Based on a Clinical Study of 50 participants with dull/lacklustre skin, using the product regularly for 4 weeks.

After 1 day…
88% agree product does not leave the skin feeling dry.**

After 1 week…
95% agree product is gentle and non-irritating.**
89% agree skin looks radiant and luminous.**

After 2 weeks…
90% agree skin looks smoother.**
88% agree that their skin looks glowing.**
83% agree skin tone was evened.**

After 4 weeks…
90% agree skin feels hydrated and not stripped, after regular use.**
89% agree the product visibly improves skin appearance.**

**Based on an Independent Consumer Trial of 110 participants using the product for 4 weeks.

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