Malic acid is a naturally occurring compound produced by the human body when sugar or carbohydrates are broken down into energy. It is also found in various fruits and vegetables. Although malic ...

Oxalic acid, or oxalate, is a compound in many plant foods. In large quantities, it can inhibit the absorption of some nutrients. Learn more.

Because it's time-consuming to test oxalic acid levels in each spinach plant, ... Or they can squeeze some lemon juice on top of fresh spinach, as the ascorbic acid (vitamin C) ...

Why it's so great: It's oil-free, it uses a relatively low dose of L-ascorbic acid, and it includes hydrating powerhouse vitamin B5—plus, the formula is packed with ceramides and hyaluronic acid ...

L-ascorbic acid is the most powerful type of vitamin C and can help brighten skin and prevent signs of aging. Here are the best L-ascorbic acid serums, according to derms and editors.

Dermatologists weigh in on the best L-ascorbic acid serums for glowing skin. Shop top-rated vitamin C serums from SkinCeuticals, CeraVe, L'Oréal, and more.