I just got this product. On my first workout I only used one scoop and it made my heart beat way too fast... Is this normal when using the product. Also would me being only 17 have anything to do with that since it says for 18 and older? it did give me better pumps and I felt I could lift alot mor that normal. It made my stomach hurt a bit at first but that might've been because i ate 30 mins before working out too. great taste though |