Psidium guajava (Guava) Extract is a botanical ingredient obtained from the leaves or fruit of the guava plant, notable for its high concentration of polyphenols, flavonoids (including quercetin), tannins, carotenoids, and vitamin C derivatives. In skincare formulations, guava extract is primarily valued for its antioxidant, antimicrobial, and astringent properties, which contribute to protection against oxidative stress, regulation of excess sebum, and improved skin clarity. The polyphenolic fraction helps neutralize reactive oxygen species generated by UV exposure and environmental pollutants, while tannins support pore-tightening effects and surface refinement. These characteristics make guava extract particularly suitable for formulations targeting uneven tone, acne-prone skin, and early signs of photoaging.

In hair care and scalp formulations, Psidium guajava extract is commonly incorporated for its scalp-balancing and strengthening support. The extract’s antimicrobial activity may help maintain a healthier scalp microbiome, while antioxidant compounds protect follicular structures from oxidative damage linked to scalp inflammation and premature hair weakening. Additionally, guava extract has been investigated for its ability to support keratin integrity and improve hair fiber resilience when used in conjunction with conditioning polymers and emollients. While not a primary conditioning agent, it functions effectively as a bioactive support ingredient in shampoos, scalp treatments, and fortifying hair masks.