There are many factors that go into the costs of an Equine Supplement. Here at Stamina Plus we try to keep the cost as low as possible. The costs at Stamina Plus include; Research (cost of horses, housing, feed, Veterinary costs that at a minimum is $100,000 per year), Cost of nutrients ( that go up every year), Packaging and shipping ( UPS has increased rates by 400% in the last 10 years). With Stamina Plus it is important to remember that research has shown that our supplements increase digestion of hay by 15% which saves you 90 lbs of hay per month per horse or 1080 lbs of hay per year.