> Information Center > Technical FAQs > Peptides Synthesis Technology Column > What are peptides? Have peptides considered biologics?Peptides are short strings of amino acids, typically comprising 2–50 amino acids. Amino acids are also the building blocks of proteins, but proteins contain more.
Peptides may be easier for the body to absorb than proteins because they are smaller and more broken down than proteins. They can more easily penetrate the skin and intestines, which helps them to enter the bloodstream more quickly.
The peptides in supplements may come from plant or animal sources of protein, including:
eggs
milk
meat
fish and shellfish
beans and lentils
soy
oats
flaxseed
hemp seeds
wheat
Scientists are most interested in bioactive peptides, or those that have a beneficial effect on the body and may positively impact human health.