The skin tingle is Beta-Alanine or Beta-Alanine Ethyl Ester HCl cant remeber which it has without looking!!
Beta - Alanine is a great product, Beta Alanine is a non-essential amino acid that combines with L-Histidine to help form Carnosine. Beta Alanine elevates Carnosine concentration in muscles and is useful for anyone participating in sports which require explosive actions, for example sprinting, weight training or boxing.
when i use I take about 1.5-2g in fruit cordial 40 mins before my workout, along with my cee. after about 20 mins, it gives you a crazy tingling sensation from inside. I feel it helps a bit with endurance during workout