With my horses at home, the only year round supplements I feed are flax seed meal, BOSS and one (the EPSM horse) gets added Cool Calories. Everyone gets beet pulp but I feed different brands to different horses because it is what works best on that individual. So I actually use Purina, Nutrena, Spiller and Triple Crown The hay is mixed grass, and when there is no green on the ground, I add a little alfalfa. In the early spring I add a multivite with heavy Vita A, that seems to keep Rainrot at bay and electrolytes during the dog days of summer.
Before they came home and were boarded, I had Smartpaks for my Smartpaks. While boarded my horses did not look as good, I had rougher coats, more skin problems, higher worm loads in the fecals. It makes sense, boarding barns are a business. Nutrition is based on the the average horse, higher populations and more shared equipment are almost required to keep that business at break even.
There is also subtle peer pressure that says if the boarder who has it all together feeds"Sea Snail Snot", then maybe I will try “Sea Snail Snot”, it can’t hurt, can it? Supplements say you care about your pony…In many cases “Sea Snail Snot” might be filling in some gaps in the one size fits all horse feed that is being fed at the boarding barn.
IMHO, The joint supplement and gastric supplement revolution is owners trying to protect their financial and emotional investment. These supplements do work for some horses and not for others. Same as in humans. If you are blessed enough to have the space to provide constant movement and forage you can skip the gastric and wait a bit longer on the joint supplements. If a horse is traveling, has limited turnout or forage, or is in a stressful situation, prophylactic gastric and joint supplementation is a wise choice.
I do not think of Rx meds as supplements.
I do know people who feed horses upwards of 25 different supplements because some rider got paid to say that they won because they use “Snake Oil Serum”. So Puffy the Pasture Pony gets all these supplements and the owner is afraid to stop any one of them because Puffy might be somehow “less”.
Every thing in Moderation. If my horse is slick coated, bright eyed, moving well and cleaning the bucket. I call that a win. If I don’t have to get Smartpak involved, I call it a win-win.