Provided are process of regulating expression of one or more genes or proteins involved in circadian rhythm. A subject such as a cell is administered or contacted to an extract of rosemary, an extract of hemerocallis fulva, or combinations thereof, optionally provided as a component of a dietary supplement. The presence of one or more active agents in the extracts administered at a targeted administration time alters the expression of one or more genes or proteins involved in circadian rhythm, illustratively CLOCK, BMAL1, FBXL3, FBXL21, or SIRT1.