Metabolites, bio-active

Biological molecules, the intermediates and products of metabolism, have various functions, including fueling, supporting structurally, signaling, stimulating and inhibiting enzymes, catalytic activity of their own (usually as a cofactor to an enzyme), defense, and interactions with other organisms (e.g. pigments, odorants, and pheromones). A primary metabolite is directly involved in normal “growth,” development, and reproduction.