BioParathyroid is the vendor name used by BioLongevity Labs for the Khavinson parathyroid peptide bioregulator cytomax A-21, sold under the trade name Bonothyrk. Like the other cytomaxes in the A-1…A-21 series, it is a natural complex of low-molecular-weight peptides (up to 5000 Da) isolated from parathyroid tissue of young animals (calves not older than 12 months of age or pigs), originating from the research program of the St. Petersburg Institute of Bioregulation and Gerontology led by Professor V. Khavinson.
Bonothyrk is not a single characterized molecule: it has no defined amino-acid sequence and no CAS number, and it is distinct from the synthetic short-peptide cytogens (e.g. Vesugen, Chonluten). The vendor’s product page identifies it as peptide complex A-21 (parathyroid glands peptides) under the natural peptide combinations (cytomaxes) class. Published material on this preparation consists of institute clinical-study reports on the cytomax series rather than peer-reviewed molecular pharmacology. This entry is for research reference only; the preparation is not for human or veterinary use, and no medical or efficacy claims are made here.