Tetrahydrobiopterin (BH4) is a necessary cofactor for the synthesis by the body of neurotransmitters containing amines (catecholamines), such as dopamine and serotonin. BH4 is needed to convert phenylalanine to tyrosine and to convert tyrosine to L-DOPA. The conversion to L-DOPA is the “rate limiting step,” (the step that controls the speed of the reaction) in […]
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Regular Store Hours
9am-9pm Every Day
Senior & High-Risk Only: 9am-10am
(415) 863-0620
1745 Folsom St
Shop from Home with


