Abyssinian Oil – When used in hair care products, the oil claims to improve manageability, shine, moisturisation and protect against irritants. Amino Acids – Cysteine. Cysteine is, inarguably, the most crucial of amino acids for hair growth. Methionine is another essential amino acid for hair growth. Silk Protein - Silk protein helps to improve the shine of the hair while also adding to the hairs elasticity to prevent breakage. It also has great moisture binding capabilities helping your hair to retain moisture for longer periods of time.