Does The Source of Vitamins make a difference?

At Stamina Plus we have been studying Vitamins manufactured in the US compared to Vitamins manufactured in other Countries. The response of the horses In the research facility shows us that there is a difference in quality and response from different manufactures. Therefore in Stamina Plus products where ever possible only US manufactured Vitamins are used. This is one of the ways that Stamina Plus continues to offer the highest quality products with proven results.