So i was advised not to use Gohpw cause it changes the recipe to much.  BUT my gliders were fat and getting fatter it seemed.  So I made it anyway, about 2 years ago.  My gliders, 6 of them, were 5 years old and now 7.   I just made my first batch of regular OHPW after two years, cause I forgot to buy the green juice (bolthouse brand) and most of the gliders have lost some weight.    So... healthy gliders eating GOHPW for 2 years.   never heard of the garlic issue, it must be 
a very small amount, plus that is mixed with honey and water will dilute it down even more.