Betaine HCl increases the level of hydrochloric acid in the stomach. This is necessary for proper digestion and assimilation of nutrients from all the food you consume. There are required normal levels of hydrochloric acid for a complete digestion of proteins and absorption of amino acids. The process of extraction of Vitamin B12 requires a healthy amount of hydrochloric acid. It is therefore used for restoring and maintaining the correct acid levels in the stomach and maintains healthy GI function. Make sure to check with your health care practitioner before commencing supplementation so that you are taking in enough or not too much Betaine HCL.