Coconut water contains indole-3-acetic acid (IAA), the primary auxin in plants [34,35]. IAA is a weak acid (pKa = 4.75) that is synthesized in the meristematic regions located at the shoot apex and subsequently transported to the root tip in plants [36]. For many years, tryptophan was assumed to be the precursor of IAA and this was later confirmed using experiments involving seedlings of Phaseolus vulgaris subjected to stable isotope labeling studies [37]. IAA occurs not only in the free form, but is also conjugated to various amino acids, peptides, or carbohydrates. These IAA conjugates are biologically inactive and appear to be the IAA storage forms in seeds and are probably involved in hormonal homeostasis