This essential amino acid is a critical component of collagen, elastin, and enamel protein. It’s found in high concentrations in the heart, skeletal muscles, and central nervous system.
L-Phenylalanine – 4 mg
![](https://www.vigrxnitricoxide.com/wp-content/uploads/2019/12/phenylalanine.png)
This essential amino acid is a critical component of collagen, elastin, and enamel protein. It’s found in high concentrations in the heart, skeletal muscles, and central nervous system.