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L-Tyrosine is often studied for its role in supporting mental performance during demanding tasks

There is a mirror form, D-carnitine , which is not only inactive but can negatively interfere with the absorption of natural L-carnitine (to be absolutely avoided in any supplement)

Store in a cool, dry place after opening

One other interesting thing from this research is that female dogs showed more pronounced effects compared to male dogs

PLoS One 9(12):e115190 Ji G, Yan L, Liu W, Qu J, Gu A (2013) OGG1 Ser326Cys polymorphism interacts with cigarette smoking to increase oxidative DNA damage in human sperm and the risk of male infertility