With all due respect these companies arent dropping their quality. Reforvit is and has always been underdosed in liquid form and less so in pill form, that said its one of the best buys on the market even considering that. Figure they are 17-21mg/ml instead of 25mg. The quality control on ref-b (all other loeffler products IMO are shit) isnt the best but these companies arent one month making awesome products and the next making 2mg/ml, its the same product coming off the same line with the same machines/computers at the same settings this goes for all the reputable vet companies in mex. Brovel and loeffler have Quality Control issues but what it means is that 1 bottles comes out significantly higher or lower than the previous batch sometimes.