Glycolic vs Lactic Acid: Body Exfoliation Explained

Choosing between glycolic and lactic acid for body care depends on the size of the molecule and the depth of penetration required. Glycolic acid, possessing the smallest molecular weight of the alpha hydroxy acids, offers the deepest penetration for smoothing surface texture. Lactic acid provides a larger molecular structure that remains more superficial, offering hydration alongside its exfoliating capacity.

Both acids function by loosening the bonds between dead skin cells to promote shedding. Selecting the appropriate agent for your skin type prevents unnecessary irritation while achieving an even appearance.

Cleanse the skin. Begin with a gentle, non-stripping cleanser to remove surface debris and oils. Warm water helps soften the top layer of the epidermis. Pat the skin until it is almost entirely dry before proceeding. Applying acids to damp skin increases absorption rates, which may inadvertently lead to irritation.
Dispense the product. Pour a small amount of the chosen acid into the palm of your hand or onto a reusable silicone applicator. Do not oversaturate the area. A thin, even layer is sufficient to cover the limbs or torso. Avoid areas with thin skin, such as the inner elbows or behind the knees, during the first few applications.
Apply to the body. Massage the product using long, sweeping motions. Start at the extremities and move toward the center of the body. Allow the solution to remain on the skin without rinsing, as these products are designed to be leave-on treatments. Ensure the product is fully absorbed before dressing.
Seal and protect. Once the acid has absorbed, apply a basic, occlusive moisturizer to the treated areas. This prevents moisture loss and maintains the barrier integrity. Do not skip this step, as acid-exfoliated skin is more susceptible to dryness. Use a broad-spectrum sunscreen on any exposed skin for the duration of the week.

Exfoliation is not about intensity; it is about consistent, mild removal of surface debris.