Preg/nursing mare supplements?

Looking for a really good supplement for an about to pop mare to help ensure good health while nursing?

I use Mare Plus on my 9 mo preggo mare. It seems to be working well. It was $40 at my local TSC store. It's for pregnant mares, nursing mares, breeding stallions and for broodmares to get them into breeding health.

Thanks, I will check into it.