Levitide is a neurohormone-like peptide, can be isolated from skin secretions of the South African frog Xenopus laevis. Levitide comes from preprolevitide, is 88 residues long and contains contains the levitide peptide at the C terminus (Glu-Gly-Met-Ile-Gly-Thr-Leu-Thr-Ser-Lys-Arg-Ile-Lys-Gln-NH2) and the putative signal sequence at the N terminus.

FEN1-IN-2 is a selective and potent inhibitor of flap endonuclease 1 (FEN1), inhibits FEN1 and XPG, has potential anticancer activity, and can be used to study DNA damage repair.

Vinaginsenoside R4 has melanogenic inhibitory activity, it may have potential as a new skin whitening compound.