High in omega-3 fatty acids, Cox Vet Lab Gain Weight Powder Horse Supplement can promote weight gain in your horse, while also supporting endurance and a healthy, shiny coat. Cox Vet Lab Gain Weight Powder Horse Supplement is also great for your younger horse, as it can promote growth and support the overall body condition. As a horse parent, you know that colic can be especially dangerous for horses, but adding just a small amount of this powder to her daily meal, can help decrease the likelihood of colic, keeping your equine friend fit as a filly.