Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Jan and thank you for your patience,
4 lbs of Triple Crown Lite will cover all of the vitamin and mineral needs so there is no need to add an additional supplement. And I believe it also contains probiotics. So the only reason you would consider Purina Wellsolve L/S would be for the additional magnesium. I recommend staying with TC Lite and if your horse show any signs of insulin resistance (cresty neck, crease going down the spine, fatty tail head and shoulders) then you can add additional magnesium (and chromium) by feeding Quiessence. Otherwise, sounds like you're on the right track!
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
Hope this finds you well and ready for winter.
Winter is coming and horses (my gelding and my new mare) will be coming into the dry lot soon and off of pasture, stalled at night. They are in very good shape and easy keepers. I will up the TC Lite to 4lbs divided into two feedings, add 1/4 measured cup Horseshine flax (has B Vits)again, and free hay,salt,water.
Do I need to supplement A,E or B Vit? Add pre-biotic?
Also have been reading about the Wellsolve L/S, would this be a better solution than TC Lite with the added Vitamins? They do not love the taste of TC and sometimes leave some of it, and wonder if they would like the Wellsolve better.
Any other suggestions would be appreciated by me and my horses!
Thank you for all of your help.
Where are you from? Bayfield, CO