10 Best Weight Gain Supplements For Horses 2026 in the United States

The Horse XL supplement by Equinety is designed primarily to support injury repair, joint health, and hoof strength in horses of all ages and breeds. Its key benefit is its high-quality blend of essential amino acids, which are important building blocks for muscle and tissue repair. The supplement is free from fillers, soy, sugar, and artificial additives, making it a clean, natural option that is safe for regular use. One tub provides a 100-day supply with a simple dosing routine.

This product focuses on providing protein through amino acids rather than delivering calories or fats to increase a horse’s weight. It comes in an unflavored powder form that is easy to mix with feed, supporting palatability. While it does not contain added vitamins or minerals targeted at weight gain, its natural and pure ingredients contribute to good digestibility, which supports overall health and nutrient absorption.

Horse XL also claims to aid mental focus and immune health, extending its benefits beyond joint and hoof care. It is a solid choice for enhancing recovery, muscle repair, and joint function with a clean, vet-approved amino acid formulation. For those seeking a supplement specifically aimed at weight gain with higher calories, fats, and comprehensive vitamins and minerals, other products may be more suitable.

Equine Performance Peptides is an organic supplement designed to support weight gain, muscle development, and overall performance in horses. It uses human-grade alfalfa powder combined with a unique Isotide Peptide Complex that includes amino acids and growth factors to aid cellular repair and boost the endocrine system. This supplement offers good protein content through peptides and supports fat and caloric intake indirectly by promoting efficient nutrient absorption thanks to its probiotic content, which helps with digestibility.

Additionally, it delivers important vitamins and minerals that help maintain strong hooves and healthy joints, which is beneficial for active or competitive horses. The powder form allows easy mixing with feed or use as a treat, which enhances palatability. The product’s organic and clean sport status makes it appealing for owners concerned about prohibited substances. Horses with very high energy needs might require additional supplements beyond this formula.

This supplement is ideal for horse owners seeking a natural, multi-benefit product that supports weight gain while also improving digestion, joint health, and recovery.

The Manna Pro Weight Accelerator for Senior Horses is specifically designed to help older horses gain weight and improve their body condition. This supplement boasts high levels of fat and calories, which are essential for weight gain. Notably, it includes Omega 3 Fatty Acids from flaxseed, which support healthy skin and coat, making it a multipurpose product. Additionally, the formulation contains probiotics for better digestion and biotin for hoof growth, addressing common health concerns in senior horses.

Essential vitamins and antioxidants included in the mix help in boosting the immune system, which is crucial for older horses. One of its main strengths is its palatability, ensuring that horses are likely to consume it without fuss. The inclusion of active ingredients like ascorbic acid and vitamin E further enhances its nutritive value. However, while it's noted to be highly palatable and easy to feed, it’s essential for users to monitor the horse's response to the supplement.

The product is suitable for all breed sizes and life stages, although its main target is senior horses. Potential users should consider the substantial packaging weight, as the 8-pound size could be cumbersome for some. This supplement shows indications of positive outcomes, but always consult with a veterinarian before beginning any new dietary regimen for your horse to ensure it suits their specific health needs.