Glycolic Acid: Exfoliation and a Radiant Complexion

What is glycolic acid, and what is its role in cosmetics?

Glycolic acid is a naturally occurring alpha-hydroxy acid (AHA) extracted primarily from sugarcane. It is widely used in dermatology and cosmetics for its exfoliating properties, its effect on cell renewal, and its effectiveness against various skin problems.

Thanks to its small molecular size, it penetrates deep into the epidermis, helpingto remove dead skin cells, brighten the complexion, reduce wrinkles and fine lines, and minimize skin imperfections.

What are the benefits of glycolic acid for the skin?

Glycolic acid is known for its multifaceted effects on the skin:

• Powerful exfoliation: It dissolves dead skin cells, stimulates cell renewal, and refines skin texture.
• Reduction of wrinkles and fine lines: It promotes collagen production, thereby improving the skin’s elasticity and firmness.
• Fights pigmentation spots: It helps brighten the complexion, reducing dark spots, acne scars, and uneven pigmentation.
• Sebum regulation: It effectively combats excess sebum, reducing the appearance of blackheads and pimples.
• Improved skin hydration: It strengthens the skin barrier, optimizing the skin’s ability to retain moisture.
• Reduction of blemishes: It helps prevent and treat acne lesions, reducing inflammation and promoting healing.

How to Use Glycolic Acid Safely?

Glycolic acid should be gradually incorporated into a skincare routine to avoid irritation:

• Low concentration (5–10%): Suitable for sensitive skin or for daily use as a lotion or serum.
• Moderate concentration (10–20%): Recommended for skin accustomed to AHAs, for a more intense exfoliating effect.
• High concentration (30% and above): Used in dermatological peels under medical supervision.

It’s essential to apply sunscreen during the day, as glycolic acid makes the skin photosensitive and increases the risk of hyperpigmentation.

What skin types can use glycolic acid?

Glycolic acid is suitable for most skin types, but certain precautions should be taken:

• Normal to oily skin: Fully benefits from its exfoliating and sebum-regulating effects.
• Combination skin: Can use it to even out the complexion and control excess sebum.
• Sensitive skin: Should opt for low concentrations, as glycolic acid can cause irritation and redness.
• Acne-prone skin: Helps unclog pores and reduce breakouts, while avoiding excessive application that could weaken the skin barrier.

What are the side effects and precautions for using glycolic acid?

Glycolic acid is generally well tolerated, but some side effects may occur:

• Redness and irritation: Especially during the first few applications or at high concentrations.
• Dry skin: It can compromise the skin’s lipid barrier if used excessively.
• Increased sensitivity to the sun: Unprotected exposure can lead to sunburn or hyperpigmentation.

It is recommended to perform a patch test before incorporating glycolic acid into your skincare routine and to avoid applying it to damaged or highly reactive skin.

What is the difference between glycolic acid and other AHAs?

Glycolic acid is a type of AHA, but it differs from other acids due to its small molecular size, which allows it to penetrate deeper into the skin.

• Lactic Acid: Gentler and better tolerated by sensitive skin.
• Mandelic Acid: Ideal for reactive skin prone to hyperpigmentation.
• Citric Acid: Primarily used for its skin-lightening properties.

Glycolic acid is the most effective for intense exfoliation, but must be used with caution to avoid unwanted side effects.

Can glycolic acid be combined with other active ingredients?

Glycolic acid can be combined with certain active ingredients, but some combinations should be avoided:

• Hyaluronic Acid: Helps maintain skin hydration after exfoliation.
• Niacinamide: Soothes the skin and reduces redness.
• Retinol: Risk of irritation and damage to the skin barrier.
• Vitamin C: May be too harsh when combined with glycolic acid.

It is recommended to space out these ingredients in your skincare routine to avoid skin reactions.

How long does it take to see the effects of glycolic acid?

The first visible results generally appear after one to two weeks of regular use. A significant improvement in skin texture, radiance, and even skin tone becomes apparent after 4 to 6 weeks.

Long-term use helps reduce the signs of skin aging, improve skin texture, and fade scars and dark spots.