Swanson L-Lysine is an essential amino acid that helps alleviate stress in the body. It regulates the immune system and assists us in managing everyday stress. Each capsule delivers 500 mg of L-lysine to meet the additional demands during periods of high stress.

Swanson N-Acetyl L-Tyrosine supplement is a fast-acting form of this essential amino acid. It is better absorbed and utilized more fully than other supplementary L-tyrosine products. L-tyrosine is a key component in the production and transmission of neurotransmitters that play a crucial role in our mental well-being.

A scientifically formulated amino acid that works synergistically with your body to boost endurance, enhance muscle pumps, and promote blood flow.

Glycine is the smallest and simplest amino acid, which makes it versatile for use in a variety of functions.

Taurine has several important functions in the body. One of its main tasks is to assist in the conversion of proteins.

L-tryptophan, an essential amino acid, is not synthesized by the body and must be obtained through dietary sources. Doctor's Best L-tryptophan contains TryptoPure, a highly purified pharmaceutical-grade L-tryptophan that meets the purity standards of both the Japanese Pharmacopoeia (JP) and the United States Pharmacopoeia (USP)

Tyrosine is a conditionally essential amino acid that plays a crucial role as a precursor to important neurotransmitters in the brain, such as dopamine, epinephrine, and norepinephrine.

Doctor's Best L-Arginine Powder helps support athletic endurance and helps increase nitric oxide production. L-arginine is a necessary precursor to creatine that helps supply energy to all the cells in the body.