The present invention relates to a process for converting keratin into a liquid mixture comprising peptides and/or amino acids comprising the following steps: a) decomposing a keratin containing material, preferably pig hair, in presence of at least one microorganism apt to decompose keratin, to obtain a decomposed keratin containing material; b) treating the decomposed keratin containing material to obtain a modified keratin containing material; c) treating said modified keratin containing material with at least a proteolytic enzyme to obtain a keratin hydrolysate; and d) treating said keratin hydrolysate to obtain a liquid mixture comprising peptides and/or amino acids. The present invention further relates to a liquid mixture obtained from said process and to uses thereof.