semi-essential

L-Cysteine hydrochloride hydrate (L-Cysteine hydrochloride monohydrate) is a conditionally essential amino acid, which acts as a precursor for biologically active molecules such as hydrogen sulphide (H2S), taurine and glutathione. L-Cysteine hydrochloride hydrate suppresses ghrelin and reduces appetite in rodents and humans.

L-Histidine (L-(-)-Histidine) is a semi-essential amino acid (children should obtain it from food) needed in humans for growth and tissue repair, L-Histidine is important for maintenance of myelin sheaths that protect nerve cells and is metabolized to the neurotransmitter histamine. Histamines play many roles in immunity, gastric secretion, and sexual functions. L-Histidine is also required for blood cell manufacture and protects tissues against damage caused by radiation and heavy metals.

Cysteine monohydrate is a semi-essential proteinogenic amino acid.

Cephalosporin Canalog-1 is an analogue of Cephalosporin C, which exhibits relatively weak resistance to both Gram-positive and Gram-negative bacteria. Cephalosporin C is stable against penicillinase but can be decomposed by cephalosporinase. Through hydrolysis, its side chain can be removed to yield 7-amino-cefenoic acid (7-ACA), an essential raw material for producing semi-synthetic cephalosporins.