Science has gotten over the yuck factor and surgeons have gone back to leeches for post-surgical treatment, maggots for selectively debriding wounds (they only eat the dead tissue). I wouldn't be surprised to find that something in cow urine can have a therapeutic effect - but I think I'll wait on that one until something is proven. Mare's urine was the source of the first estrogen and progesterone supplements, but that was probably concentrated compared to the raw stuff.
Med Hypotheses. 1991 Nov;36(3):195-9.
Melatonin supplementation from early morning auto-urine drinking.
Mills MH, Faunce TA.
Department of Psychology, University of Newcastle, NSW, Australia.
The pineal hormone melatonin and its conjugated esters are present in morning urine in significant quantities. Drinking the first morning urine restores plasma night-time melatonin levels due to deconjugation of its esters to melatonin. Exogenous melatonin, by either regulation of the sleep-wake cycle or enhancement of the physiological prerequisites for mediation (decreased body awareness (i.e. analgesia) and claimed slowed brain wave activity and heightened visualization ability) may be the mechanism behind the alleged benefits of 'amaroli'.
Yeah ... I've got a bottle of melatonin tablets, sometimes take one at night, will stick with my current strategy.