The Derma Co 2% Kojic Acid Advanced Face Cream Versus The Derma Co 3% Kojic Acid Dark Spot Corrector Gel

In head-to-head biochemical assays, it outperformed kojic acid, arbutin, and even hydroquinone at slowing melanin production.

Clinically, 0.1% has shown to improve melasma visibly after just 4 weeks. Another liposome-encapsulated version performed similarly well and an Indian study on 0.3% showed significant melasma reduction over 8 weeks with no adverse events reported.

This ingredient is generally well-tolerated. A very small amount of people have experienced mild dryness or peeling at a higher concentration (0.3%).

According to a manufacturer, this ingredient is sensitive to air. Good formulations should account for this to keep your rucinol effective.

Be sure to also check out Thiamidol, another "hydroquinone alternative".

Glycolic acid removes the top layer of dead skin cells to allow newer and fresher ones to emerge.

AHAs work by breaking down the structural “glue” that holds old skin cells in place. When that buildup is gone, your skin can renew itself more efficiently.

Research also shows glycolic acid stimulates collagen production, helping to firm and thicken the skin over time. This is one of its biggest advantages over other AHAs.

Overall, glycolic acid helps with:

Fun fact: Glycolic acid boosts skin hydration by helping it produce molecules that increase hyaluronic acid naturally.

To work best, glycolic acid products should have a pH between 3-4 (that’s where exfoliation is most effective but still gentle on skin).

The pH and concentration of a product are key to its effectiveness:

It is normal to feel a slight stinging sensation when using glycolic acid. This usually fades as your skin adjusts.

Because glycolic acid has the smallest molecular size in the AHA family, it can penetrate deeper, which enhances its effectiveness but also makes it more likely to irritate sensitive skin.

If your skin is very sensitive or prone to rosacea, glycolic acid may be too strong; in that case, try milder options like lactic acid or a PHA instead.

Recent studies suggest glycolic acid might even help protect against UV damage. But don’t skip sunscreen! Freshly exfoliated skin is more sensitive to the sun.

Glycolic acid is a skincare superstar. It smooths, brightens, hydrates, and firms the skin. Unless you’re highly sensitive, it’s well worth adding to your routine.

Read more about some other popular AHA's here:

It plays well with most ingredients and is typically used at 0.1-1%. However, concentrations up to 50% have been reported in moisturizers.