NAF Devil's Relief Liquid 1 Litre. NAF Devil's Relief Liquid is a combination of herbal extracts and tinctures formulated with Devil's Claw. NAF Devil's Relief is particularly beneficially for older and stiff horses. NAF Devil's Relief Liquid has a bitter formulation that can also stimulate the digestive. NAF Devil's Relief Liquid can be fed to all horses and ponies except pregnant mares. Due to containing the herb Devilâ€™s Claw, Devils Relief now contains an FEI banned substances. Read more… Any horses wanting to compete should not be fed Devil's Relief. Horses and Ponies Recommended Daily Amounts Loading Rate - 60-100ml per day Maintenance Rate - 20-30ml per day 1 Litre when fed at maintenance level will last approximately 50 days.