Lactic Acid Peel 70% vs Glycolic Acid Peel 70%: Which AHA Is Right for Your Skin?

When it comes to professional-strength chemical peels, two alpha hydroxy acids (AHAs) dominate the conversation: lactic acid and glycolic acid. At 70% concentration, both are considered high-potency peels reserved for experienced users and often performed by professionals. But which one is truly stronger, and which is more compatible with your skin?

In this detailed comparison, we break down the science, benefits, and potential risks of 70% lactic acid and 70% glycolic acid peels. We'll help you decide which one aligns with your skin goals—whether you're targeting hyperpigmentation, fine lines, or simply seeking a deeper exfoliation.

Understanding AHA Concentrations: What Does 70% Really Mean?

Alpha hydroxy acids work by dissolving the bonds between dead skin cells on the surface of your skin. The concentration determines the depth and intensity of the exfoliation. A 70% concentration is considered a professional-grade peel, typically used in clinical settings or by individuals with extensive experience. At this level, the peel penetrates deeper into the epidermis, stimulating cellular turnover and collagen production.

Both lactic acid and glycolic acid are AHAs, but they differ in molecular size. Glycolic acid has the smallest molecule, allowing it to penetrate the skin fastest and deepest. Lactic acid has a larger molecule, which means it works more slowly and is generally considered gentler. However, at 70%, both are potent and require careful handling.

• Always perform a patch test before applying any 70% peel.
• Never use 70% peels on broken, irritated, or sunburned skin.
• Follow the manufacturer's instructions for neutralization and timing.

Lactic Acid 70%: Gentle Yet Powerful for Sensitive Skin

Lactic acid is derived from milk and is known for its hydrating properties. It is a larger molecule than glycolic acid, so it penetrates the skin more gradually. This makes 70% lactic acid a better option for those with sensitive or reactive skin who still want a deep peel. It also acts as a humectant, drawing moisture into the skin, which can reduce the risk of post-peel dryness.

For hyperpigmentation, lactic acid is effective at fading dark spots and evening out skin tone. It also stimulates ceramide production, strengthening the skin barrier. If you have dry or mature skin, a 70% lactic acid peel can provide significant anti-aging benefits with less irritation compared to glycolic acid.

• Ideal for sensitive, dry, or mature skin.
• Provides hydration while exfoliating.
• Helps fade hyperpigmentation and improve skin texture.

Glycolic Acid 70%: Maximum Strength for Stubborn Concerns

Glycolic acid, derived from sugar cane, has the smallest molecular size of all AHAs, allowing it to penetrate the skin rapidly and deeply. A 70% glycolic acid peel is one of the strongest chemical peels available, delivering dramatic results for fine lines, wrinkles, acne scars, and hyperpigmentation. It stimulates collagen production more intensely than lactic acid, making it a favorite for anti-aging treatments.

However, with great power comes great responsibility. Glycolic acid 70% can cause significant stinging, redness, and peeling. It is not recommended for sensitive skin or beginners. If you have oily or thick skin, or if you've used lower-strength peels before, this might be your best bet for achieving a more youthful complexion.

• Best for oily, thick, or resilient skin.
• Delivers dramatic anti-aging and brightening results.
• Requires strict adherence to neutralization and aftercare.

Which AHA Peel Is Stronger? The Verdict

In terms of molecular size and penetration speed, glycolic acid is stronger than lactic acid. A 70% glycolic acid peel will exfoliate deeper and faster, producing more noticeable results in a shorter time. Lactic acid 70% is still a powerful peel, but its larger molecule means it works more superficially, making it gentler on the skin.

So, which is right for you? If you have sensitive skin, are new to professional peels, or want to minimize downtime, start with lactic acid 70%. If you have resilient skin and are looking for maximum impact on deep wrinkles or stubborn pigmentation, glycolic acid 70% may be your choice. Always consult with a skincare professional before using such high concentrations.

Safety and Aftercare for 70% Peels

Using a 70% AHA peel at home is risky and should only be attempted by those with experience and proper knowledge. Always read the instructions carefully, and have a neutralizer on hand, such as a baking soda solution or a specialized product like the PH Balancer Post Exfoliation Neutralizer, to stop the peel at the right time.

After the peel, your skin will be highly sensitive. Use gentle cleansers, moisturizers, and a broad-spectrum sunscreen. Avoid sun exposure, exfoliants, and retinoids for at least a week. Keep your skin hydrated and let it peel naturally—do not pick at flaking skin.

• Always have a neutralizer ready before applying the peel.
• Use a gentle moisturizer and sunscreen after the peel.
• Avoid picking or pulling at peeling skin.

Topical Alternatives: Serums and Creams for Daily Use

If you're not ready for a 70% peel, consider incorporating lower-strength AHAs into your daily routine. For example, a 10% glycolic acid toner can provide gentle exfoliation and improve skin texture over time. Similarly, a lactic acid-based product can offer mild exfoliation with added hydration.

For a comprehensive approach, you might pair a peel with a daily serum containing ferulic acid, which provides antioxidant protection and enhances the effects of vitamin C. This can help maintain the results of your peel and protect your skin from environmental damage.

• Use a 10% glycolic acid toner for daily exfoliation.
• Incorporate a ferulic acid serum for antioxidant support.
• Always moisturize after using any AHA product.

Deciding between a 70% lactic acid peel and a 70% glycolic acid peel ultimately comes down to your skin type and tolerance. Lactic acid is gentler and more hydrating, making it suitable for sensitive skin, while glycolic acid offers deeper, more dramatic results for resilient skin. Whichever you choose, prioritize safety and aftercare. For a professional-grade option, consider the LACTIC Acid Skin Chemical Peel 90% for an even higher concentration, or explore our range of AHA products to find the perfect match for your skincare regimen.