Peptides for Bone Health

3 research peptides are currently studied for bone health. This guide ranks them by evidence strength and covers their mechanisms, safety profiles, and current clinical status.

Evidence Rating: A

Category: Bone / PTH Analog

PTH (parathyroid hormone) is the full-length 84-amino-acid recombinant human parathyroid hormone (MW ~9425 g/mol) marketed as Natpara. Natpara is available only through a restricted Risk Evaluation and Mitigation Strategy (REMS) program due to a potential risk of osteosarcoma observed in animal studies.

Key claims: Reduces calcium and vitamin D supplement requirements in hypoparathyroidism; Maintains serum calcium in hypoparathyroidism.

Evidence Rating: D

Category: Bioregulator / Research

Cartalax is a synthetic tripeptide (Ala-Glu-Asp) developed by Vladimir Khavinson as part of the bioregulatory peptide series. It is designed to normalize cartilage and connective tissue function through epigenetic gene regulation. Evidence is limited to Russian literature.

Key claims: Joint health improvement.

Evidence Rating: F

Category: Healing & Recovery

Collagen peptides (hydrolyzed collagen) are a mixture of small peptides (typically 2-5 kDa) produced by enzymatic hydrolysis of collagen from animal sources (bovine, porcine, marine). They are not a single defined peptide but a heterogeneous category of bioactive peptide fragments. Multiple randomized controlled trials have evaluated collagen peptides for skin health, joint pain, bone density, and wound healing, with generally positive but modest results. They are widely available as dietary supplements and are classified as GRAS (generally recognized as safe) in the United States. The quality of evidence is moderate — many trials are industry-funded and heterogeneous in formulation.

Key claims: Improves skin elasticity and hydration; Reduces joint pain in osteoarthritis.