Yes, collagen can promote nail growth and strength by providing a rich source of the amino acids needed to produce keratin, the structural building block of nails. Adequate amounts of keratin in the body can help to keep nails strong and healthy. In a clinical study (1), 25 participants experienced increased nail growth, improved brittle nails and a decrease in the frequency of broken nails after ingesting collagen peptides for 24 weeks.
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References:
Cosmet Dermatol, J. (2017) Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails.
Anat, J. (2009) Structure and functions of keratin proteins in simple, stratified, keratinized and cornified epithelia.