i m agreed with suchandra..
IN ayurveda medicines its mentined that some products are prapred from cow urine like, chandraprabhavati, gokhargugulu, etc.. and accoridnt to ayurveda the food what we eat thats go inside and form 7 dhatu in form of ras, rakt, mas,med maza, asthi, sukra,, so all those are final products to make growith of body and urine is waste product of body that in ayurveda call form of Malla,, ( malla is waste part of body) and in Ayurveda mall are various types like puris,mutra, karna mall. so how come it will be mentioned that self urince of first time of morning is good for health.. even i had heard from many people but it wont be a fact of ayurveda..
regards
adwait