Did your father let the yeast sit in water first or did he add the powder directly to honey? Did he let it ferment at all?I am gonna say Brewers yeast. My dad gave it to me and my brother everyday when we were little. He mixed it with raw honey. We did not get the measles or chicken pox, although I did get the mumps it was only painful for an afrernoon. We were never sick with colds or flu. I never had the flu till I was in my 20's.