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Herbsmith Rx Yi Yi Ren San is a classical Chinese herbal formula recommended by holistic veterinarians to support dampness resolution, intestinal health, blood circulation, and musculoskeletal comfort in dogs, cats, and horses. Based on the traditional formula Yi Yi Ren San (also known as Coicis Powder, Coix Formula, and Jing Tang Coix Formula), it benefits dampness, moistens the intestines, invigorates the blood, and supports comfort by addressing qi and blood stagnation. It is well suited for pets presenting with damp accumulation, blood stasis, or bi syndrome patterns such as joint stiffness, intestinal dryness, skin conditions associated with dampness, or musculoskeletal discomfort. Available as a concentrated powder mixed into food; cats and dogs use the Canine Blend, while horses use the Equine/Horse Blend. Dosing varies by species and body weight, and your authorizing veterinarian will provide specific guidance.
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For Dogs (Canine Blend Powder):
For Cats (Canine Blend Powder): ¼ tsp twice daily, or as prescribed
For Horses (Equine/Horse Blend, 1,000 lb horse): Two tablespoons twice daily for 20 days, then two tablespoons once daily in grain. If the horse initially refuses, start with a small amount mixed into grain and gradually increase until the horse is accustomed to the taste. Most horses will readily accept the herbs in their grain.
Active Ingredients: Yi Yi Ren (Semen Coicis Lachryma-jobi), Gua Lou Ren (Semen Trichosanthis), Mu Dan Pi (Cortex Moutan Radicis), Tao Ren (Semen Persicae)
Inactive Ingredient: Flaxseed
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Yi Yi Ren San combines four herbs that address dampness, blood stasis, and heat simultaneously, making it effective for complex patterns involving multiple pathogenic factors:
Yi Yi Ren San contains blood-invigorating herbs, including Tao Ren and Mu Dan Pi, with blood-moving and mild anticoagulant properties. Pets currently on prescription medications should use this formula under veterinary supervision, as herb-drug interaction research in dogs and cats remains limited.
Medication categories warranting extra caution include anticoagulant or antiplatelet medications, non-steroidal anti-inflammatory drugs (NSAIDs), immunosuppressive drugs, and pets managing multiple concurrent prescriptions. Your authorizing veterinarian can determine appropriateness based on your pet's condition, current medications, and laboratory results.
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In Traditional Chinese Veterinary Medicine, Yi Yi Ren San is indicated for patterns involving damp accumulation combined with blood stasis, presenting as joint swelling and stiffness, skin conditions with a damp or weeping quality, intestinal dryness, musculoskeletal discomfort, or urinary difficulty with a damp-heat component. It is a good alternative to Coicis Powder, Coix Formula, and Jing Tang Coix Formula, and is appropriate for pets whose stiffness or discomfort has both a damp and a blood stasis component.
Mix the powder directly into food or grain at the dose recommended for your pet's species and body weight. Both dogs and cats use the Canine Blend; horses use the Equine/Horse Blend. Dogs and cats receive the formula twice daily; horses receive two tablespoons twice daily for the first 20 days, then once daily for maintenance. Your authorizing veterinarian will confirm the appropriate dose and schedule for your individual pet.
Response time varies depending on the severity and chronicity of the damp and blood stasis pattern. Many pets show improvement in joint comfort, mobility, and skin condition within 3 to 6 weeks of consistent use. Chronic or deeply rooted damp-stasis patterns may require a longer course of treatment, and your veterinarian may recommend periodic reassessment to adjust the formula or dosing as your pet responds.
Combination with complementary TCVM formulas is common in holistic veterinary practice and should be guided by your authorizing veterinarian based on your pet's full pattern diagnosis. Because this formula contains blood-invigorating herbs with mild anticoagulant properties, veterinary oversight is especially important if your pet is on NSAIDs, anticoagulants, or antiplatelet medications, to ensure the treatment plan fits your pet's overall health status.
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