Acetyl tetrapeptide-5

is used in cosmetic eye formulations to decrease puffiness, eye bags, and dark circles by reducing edema and protecting proteins such as SOD from glycation

Alanine

Ala / A · hydrophobic residue · neutral charge

AOD-9604

is studied as an anti-obesity peptide that can reduce weight gain and increase fat oxidation in obese animal models with generally neutral effects on IGF-1 and glucose metabolism in early human trials

Arginine

Arg / R · basic residue · positive charge

Argireline

is a topical cosmetic peptide reported to decrease dynamic wrinkles by partially mimicking the mechanism of botulinum toxin in a non-invasive manner

Asparagine

Asn / N · polar residue · neutral charge

Aspartic acid

Asp / D · acidic residue · negative charge

BPC-157

is investigated for accelerating healing of gastrointestinal mucosa, tendons, ligaments, bone, and nervous tissue in preclinical models, with anti-inflammatory and pro-angiogenic effects