Standard, shallow, easy once you've done it a couple times
It is naturally occurring in food sources
(Authors note: Collagen is a protein found in animals [such as cows, pigs, fish, etc.] and cannot be vegan
This receptor selectivity is the principal reason it is so widely used as a research reagent
It is essential for the therapy to be administered by qualified medical professionals to minimize risks
It was originally isolated in 1977 from the cerebral venous blood of rabbits and has since been found to be present in small amounts in human brains and plasma, with higher concentrations later in the day.3 4 It, or a similar substance, is also present at higher concentrations in human breast milk.5 Because DSIP can cross the blood-brain barrier and is easily absorbed via the gut (unusual for a peptide), some researchers have hypothesized that it may facilitate post-feeding sleep tendencies among newborns, though it remains unclear whether DSIP truly has a hand in neonate sleep-wake cycles.4 5 6 Its mechanism of action is likewise unclear, but it may have something to do with endocrine regulation