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Hydroxylysine is an amino acid, C<sub>6</sub>H<sub>14</sub>N<sub>2</sub>O<sub>3</sub>. It is most widely known as a component of collagen. A standard amino acid with the R' group consisting of an amino terminated butyl hydrocarbon chain, with a hydroxyl group on the carbon atom before the amino group. See also lysine which lacks the hydroxyl group of hydrolysine.
Structure is: NH2 - CH2 - CH(OH) - CH2 - CH2 - CH(NH2)COOH
The number of hydrogens vary depending on the ionization state of the molecule's carboxyl and amino groups.