Obscure fact - Soviet researchers identified homologues of melotonin with larger alkyl groups beyond that amide moity as confiring protection against radiation on the consumer.
The problem has always been with Soviet (and now in Putin's Russia) that sciences are subject to political goals.
Lest we forget, the Soviets went through several totally self-inflicted famines by desciding that a scientist in an office knew more than the people who had successfully grown foods for millenia. Forced collectivsation (the Holodomor) cause oned, Lysenkonism another and others were the result of redirecting rivers, using fertilizers and other agrochemicals that accumulated while destroying the soil.
Evidence of the last being the Aral Sea now being a toxic desert.
But it seems melotonin itself is considered quite safe.
Ironically, I would class 5-MeO DMT as NOT being safe. Even Shulgin noted that for some users the subjective effects were akin to 'being sat on by an elephant' and I know what he means. So when 5-MeO AMT was offered, I chose not to use it which in retrospect was probably a good thing as it does seem that considering just how rare it is, fatalities seem common.