You may have noticed certain amino acid supplements with the letter “L” stuck on to the front of them (i.e. L-Glutamine, L-Carnitine, L-Arginine, etc.). What does the “L” mean? The “L” stands for Laevorotatory, and refers to the stereoisomer that rotates plane polarized light to the left. Regardless of that chemical mumbo jumbo, the bottom line with these things is still to take them regularly as part of your bodybuilding training regimen. But now you have some obscure knowledge to impress your friends with. 
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