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Free-FormL-Phenylalanine is an essential amino acid that is necessary for the synthesis of proteins. Because L-Phenylalanine can be readily converted into the amino acid tyrosine, which forms part of the structure of the neurotransmittters dopamine and norepinephrine, it is important...

L-phenylalanine is a vital (essential) amino acid that is used in metabolism as a precursor for the production of L-tyrosine and the skin pigment melanin. In addition to its importance for the production of endogenous tissue, L-phenylalanine is particularly important...

Introducing our first economical, high- quality L-proline supplement. An amino acid manufactured in the liver, L-Proline serves as a precursor to hydroxyproline, which is an essential component of collagen tissues that helps maintain their structural characteristics. L-Proline is involved in...

Important for Collagen ProductionProvides Structural SupportL-Proline is an amino acid that is essential for the synthesis of collagen, the most abundant protein in mammals. Collagen is the main structural protein that constitutes all human connective tissues, including skin, tendons, ligaments,...

While L-serine is classified as a non- essential amino acid, it is nonetheless important to a variety of structures and functions within your body. Cell proliferation, nervous system functions and brain function all require adequate L-serine. It's considered non- essential...

- For the dietary treatment of chronic states of fatigue and stress-related diseases- Relaxation without inducing fatigue- Rich in natural L-theanine and polyphenols- Green tea extract from controlled cultivation- Suitable for vegetarians and vegans

- For the dietary treatment of chronic states of fatigue and stress-related diseases- For relaxation without inducing fatigue- Rich in natural L-theanine and polyphenols- Green tea extract from Sichuan province- Of a pure vegetarian origin

Promotes RelaxationHealthy Vascular FunctionWith Decaf Green TeaL-Theanine is a unique amino acid found naturally in the tea plant (Camellia sinensis). L-Theanine promotes relaxation while maintaining alertness and promotes healthy cognitive function. L-Theanine may also support healthy vascular function through this...

Promotes Relaxation.Healthy Vascular Function.With Inositol and Taurine. L-Theanine promotes relaxation without the drowsiness or negative side effects associated with other calming agents. L-Theanine also supports healthy cardiovascular function through this relaxing effect.  

What is Doctor's Best L-Theanine with Suntheanine?Doctor's Best L-Theanine with Suntheanine is a patented form of the amino acid L-theanine. L-theanine is an amino acid found in green tea that is responsible for the relaxation-inducing effect of tea consumption. L-Theanine...

Theanine is the predominant amino acid of tea that produces calming effects in the brain by increasing levels of serotonin and dopamine, and blocking the binding of L-glutamic acid to glutamate receptors. Life Extension customers can enjoy the benefits of...

Promotes Relaxation.Healthy Vascular Function. L-Theanine is a unique amino acid found naturally in the tea plant (Camellia sinensis). L-Theanine promotes relaxation while maintaining alertness and promotes healthy cognitive function. L-Theanine may also support healthy vascular function through this relaxing effect.