Why am I experiencing a weird tingling sensation after drinking HYDRATE?

A HYDRATE + Beta Alanine and HYDRATE Caffeinated varieties contain 2g of beta-alanine per serving. Beta alanine can be used to delay muscle fatigue during strenuous exercise. 

After consuming beta-alanine, your body may react with a tingling or “pins and needles” sensation in the extremities. These “tingles” are called “paraesthesia” — It is a natural reaction that some individuals have to beta-alanine and it is harmless. This sensation will typically lessen over time the more regularly you use beta-alanine.