β-Alanine is a non-specific endogenous agonist at the inhibitory glycine receptor.

H-Phg(4-OH)-OH is an endogenous metabolite.

H-Nva-OH是一种内源性代谢产物。

L-Azetidine-2-carboxylic acid is an endogenous metabolite.

2-Aminoisobutyric acid is a rare, non-protein amino acid and end-product of pyrimidine metabolism, excreted in urine and found in some antibiotics of fungal origin.

D(-)-2-Aminobutyric acid is an unnatural amino acid serving as an important intermediate in pharmaceutical production.

DL-Citrulline is an α amino acid which is a precursor for nitric oxide, it's a naturally occurring nonessential amino acid which is the key intermediate in the urea cycle.

H-Cit-OH is a natural product isolated and purified from the herbs of Citrullus lanatus.

L-Carnitine hydrochloride ((R)-Carnitine hydrochloride), a highly polar, small zwitterion, is an essential co-factor for the mitochondrial β-oxidation pathway. L-Carnitine hydrochloride functions to transport long chain fatty acyl-CoAs into the mitochondria for degradation by β-oxidation. L-Carnitine hydrochloride is an antioxidant. L-Carnitine hydrochloride can ameliorate metabolic imbalances in many inborn errors of metabolism.

2,3-Diaminopropanoic acid hydrochloride is an endogenous metabolite.

6-Fluoro-DL-tryptophan 是色氨酸羟化酶 (tryptophan hydroxylase) 的竞争性抑制剂，能够影响大鼠的睡眠周期，常用于神经生理学研究。

H-DL-HoCystine-OH (DL-半胱氨酸) 是一种含硫氨基酸，在谷胱甘肽合成和抗氧化应激反应中起重要作用。

L(-)-Pipecolinic acid is a normal human metabolite present in human blood.

D-Pipecolinic acid is a normal human metabolite found in human biofluids.

H-Orn-OH H-Asp-OH salt是由鸟氨酸和天冬氨酸这两种天然非必需氨基酸组成，可用于降低血氨水平，缓解肝硬化引起的肝性脑病症状。

Methyldopa是一种α2-肾上腺素能 （α2- adrenergic receptors ）激动剂，主要用于高血压治疗，通过在中枢神经系统中转化为α-甲基去甲肾上腺素发挥作用。

3-Fluoro-L-tyrosine is a medium supplement.

H-DL-HoCys-OH是一种神经毒素，能够影响犬尿酸的产生，进而影响认知功能和脑白质结构。它在研究神经系统疾病及相关代谢失调中具有应用前景。

H-DL-o-Tyr-OH是一种苯丙氨酸的代谢物，作为形成儿茶酚胺的前体，被用作β-地中海贫血中蛋白质氧化损伤的生物标志物。。

Levocarnitine propionate HCl is used to treat the deterioration of renal function, congestive heart failure, intermittent claudication, and other diseases.