I'm getting low on my Cosequin, and while I usually order from horse.com, looks like they raised their price a little, and valleyvet.com has it on sale, so planned on putting an order through with them. However, I remembered a few members mentioning that they like Acti-Flex 4000, so out of curiousity I went to Big Dee's website and looked to see what the ingredients are. Looks like the Acti-Flex has higher levels of chrondroitin and glucosamine than the Cosequin, plus it has additional ingredients that Cosequin doesn't have. And, I think it's cheaper per horse. Not including any shipping costs...I give my horses 2 scoops of Cosequin per day, so I'm paying, say even on the sale price of $155 for Cosequin in the large bucket that will last me 212 days, .73/day per horse...whereas the Acti-Flex is $85 for a gallon that would last me 128 days, .66/day per horse. If I did my math right, haha. It's not that I'm unhappy with my Cosequin, that's all I've ever used, and it works good. But if there's something on the market that works better, and is cheaper...is it worth my $85 (+shipping) to give it a try? Is it safe for broodmares? Breeding stallions?