peptide is a really braod term. there are like hundreds of peptides, maybe thousands.
which specific peptide are you referring to? Thymosin Alpha-1?
Thymosin alpha-1 (T α 1) is a peptide, or small protein, consisting of 28 amino acids. T α 1 is produced naturally by the thymus gland. The thymus is located behind the sternum and between the lungs, and is where immune cells known as T cells mature and are released, prompted to do so by the T α 1 peptide. T cell production and action within the body is vital to adaptive immunity—the mode by which immune cells are able to recognize and eradicate foreign invaders.