Historically, a human being was not necessarily a natural person in some jurisdictions where a slave was a thing (subject of a property right) rather than a person. In many cases, fundamental human rights are implicitly granted only to natural persons.
Phenylalanine amino acid > Tyrosine amino acid > L-Dopa > Dopamine > Norepinephrine > Epinephrine. Mucuna pruriens is an herb that contains a small percentage of natural L Dopa. Mucuna pruriens is available without a prescription. For more information on mucuna pruriens and levodopa, click on the link provided.
Dairy foods contain tryptophan, which is a sleep-promoting substance. Other foods that are high in tryptophan include nuts and seeds, bananas, honey, and eggs. Carbohydrate-rich foods complement dairy foods by increasing the level of sleep-inducing tryptophan in the blood.