A punchy resurfacing serum that visibly reduces the effects of hyperpigmentation, blemish scars, uneven tone, texture & the first signs of aging. Powerhouse exfoliator Glycolic Acid has the highest strength but smallest molecular weight of the Alpha-Hydroxy Acid family, making it more effective at penetrating the skin. The science(y) bit: it penetrates the skin and lowers the pH level, prompting cell turnover accelerating the repair and renewal processes. The results bit: bright, even, youthful skin. Directions: Use daily on cleansed skin as part of your PM routine taking breaks every other day. No guess work required with application amount; the button pipette delivers the required dose. Minimal tingling and/or redness is expected but as with all acid treatments build up skin tolerance gradually if irritation persists. Must be used in conjunction with daily broad-spectrum SPF due to increased skin sensitivity to sunlight during use. Warnings: Not suitable for sensitive, broken, or peeling skin. Do not consume. Avoid the eye area. Keep out of reach of children. pKa/pH balanced This pH of this formula is approximately 3.8. Glycolic Acid has a pKa of 3.8. pH and pKa are important values in acid products. pKa implies acid availability. When pKa is close to pH the effectiveness of an acid is maximised while irritation is reduced. High differences between pH and pka can make a formula irritating. Patch test promise We care about your skin and formulate our products to avoid irritating ingredients. However, there are so many types of sensitive skin it is impossible to accommodate everyone’s unique skin care needs. To help you minimize the chance of a negative reaction we list all ingredients for each product and explain why they are there. That way, if you know what ingredients you are allergic or sensitive to, it’s easy to see if a product contains them. If you are new to our products or are unsure whether you are sensitive to a specific ingredient we provide a free patch test with every product and recommend you use this, one product at a time, before use. If you have an adverse reaction, or any apprehension about an ingredient, you can return your unopened product to us free of charge. Ingredients Glycolic Acid, Water, Glycerine, Hydroxyethyl Cellulose, Sodium Hydroxide.