Plants containing menthol. Curiously, it is not the essential oil of mints ( Mentha spp.) the part of a plant which contains more menthol, but the essential oil of sunflower (Helianthus annuus), followed by mint species, such as Mentha arvensis, Mentha piperita, Mentha pulegium, and Mentha aquatica.
Tryptophan is a routine constituent of most protein-based foods or dietary proteins. It is particularly plentiful in chocolate, oats, dried dates, milk, yogurt, cottage cheese, red meat, eggs, fish, poultry, sesame, chickpeas, almonds, sunflower seeds, pumpkin seeds, spirulina, bananas, and peanuts.nly the L-stereoisomer of tryptophan is used in structural or enzyme proteins, but the R-stereoisomer is occasionally found in naturally produced peptides (for example, the marine venom peptide contryphan).
L-TRYPTOPHAN Overview Information. L-tryptophan is an amino acid, a protein building block that can be found in many plant and animal proteins. L-tryptophan is called an âessentialâ amino acid because the body canât make it.It must be acquired from food.-tryptophan is naturally found in animal and plant proteins. L-tryptophan is considered an essential amino acid because our bodies can't make it. It is important for the development and functioning of many organs in the body.