100% L-Ascorbic Acid Powder is a powdered form of direct vitamin C that visibly reduces signs of ageing by brightening and balancing uneven skin tone and protecting your skin from the effects of damage caused by environmental stressors. Because it's made of 100% vitamin C, it's designed to be mixed with other serums, creams, or moisturisers in your skincare routine-allowing you to create a custom vitamin C treatment. Depending on your mixture, your combination may offer a high concentration of direct vitamin c and as a result, a very strong tingling but non-irritating sensation is expected during the first 1-2 weeks of use until the skin's tolerance to such high exposure is elevated.