Tylan is a vet antibiotic, no estradiol in the component-TH....that thing acts different than the fina, I cooked it this yer for 6 months non stop, if something didnt look right, i ll trash it and buy more...till i figured out that there is some modification done on the product. Used he same recipe as fina, which was coming very nice orange color and was staying that way, clear, good tren cough everytime i use a new shooting spot. Now that component on several occasions turned to be simply yellow, after 24 hrs in the solution and all, after some heating at different temperatures, some was coming orange, some not, the orange color was getting lighter in matter of weeks and the solution was getting foggy tren cough - rarely. Nothing unusula to what Iread others experienced, but I was used to making the same product from fina over and over again for years..... and that thing just drove me crazy while trying to figure out what am i doing wrong....at the end just stopped caring about it...used it as it was...and it worked....