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Recommended by holistic veterinarians, Herbsmith Rx Forsythia Summer Heat is a Traditional Chinese Veterinary Medicine (TCVM) herbal formula designed to help manage anhidrosis in horses by clearing Summer Heat, resolving Heat toxin, eliminating Dampness, and opening the exterior to restore normal sweating. Based on the classical Xiang Ru San formula, this five-herb combination addresses the TCVM root cause of equine anhidrosis: Summer Heat, one of the six exogenous pathogenic factors in TCVM, is unique among the six in that it occurs exclusively during summer temperatures and conditions. Summer Heat invades the body, closes and obstructs the exterior, and blocks the pores from opening to release heat through sweating. The horse's inability to sweat despite heat and exercise is the hallmark of Summer Heat obstructing the exterior. Forsythia Summer Heat clears the Summer Heat pathogen, resolves the associated Heat toxin accumulation and Dampness that commonly accompany Summer Heat invasion, and opens the exterior to restore normal pore function and sweating. This formula is appropriate for horses with confirmed or suspected anhidrosis during warm-weather conditions under veterinary supervision. Available in traditional powder (500g, 900g, 1200g) and Flax Plus (30-day and 60-day supply); a six-tablespoon scoop is included with the Flax Plus format. Dosing varies by body weight and health condition; your authorizing veterinarian will provide specific guidance. Not for use in pregnant mares.
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
Active ingredients: Xiang Ru (Elsholtzia splendens) - Elsholtzia herb; Jin Yin Hua (Lonicera japonica) - Honeysuckle flower; Bai Bian Dou (Dolichos lablab) - Hyacinth bean; Lian Qiao (Forsythia suspensa) - Forsythia fruit; Hou Po (Magnolia officinalis) - Magnolia bark.
Inactive ingredients (Flax Plus only): Ground Flax Seed. Traditional Powder contains no inactive ingredients.
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
Forsythia Summer Heat is a five-herb formula derived from the classical Xiang Ru San, a foundational TCVM formula for Summer Heat with Dampness. Each herb addresses a specific aspect of the Summer Heat-Damp pattern causing anhidrosis in horses:
Herbsmith Rx Forsythia Summer Heat contains the exterior-releasing herb Xiang Ru, the Heat-clearing herbs Jin Yin Hua and Lian Qiao, and the Qi-moving herb Hou Po. This formula is primarily cooling and exterior-releasing. Horses on prescription medications should use this formula under veterinary supervision. Not for use in pregnant mares.
Medication categories warranting extra caution include medications used to manage anhidrosis or other thermoregulatory conditions (coordinate concurrent use with your veterinarian to monitor response and avoid overlapping effects), medications affecting sweating, circulation, or autonomic nervous system function, and horses on multiple concurrent prescription medications. Because anhidrosis requires active veterinary management and monitoring, all horses using this formula should remain under regular veterinary supervision throughout the treatment period. Your veterinarian can determine appropriateness based on your horse's condition, current medications, and laboratory results.
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
Anhidrosis is the partial or complete inability of a horse to sweat normally in response to heat and exercise. Without the ability to sweat, horses cannot effectively regulate body temperature, which poses serious health risks during warm weather. In Traditional Chinese Veterinary Medicine, anhidrosis is understood as a manifestation of Summer Heat pathogen invasion. Summer Heat is unique among TCVM's six exogenous pathogenic factors in that it occurs exclusively during summer temperatures and conditions. When Summer Heat invades, it obstructs and closes the exterior, blocking the pores from opening. Because sweating in TCVM depends on the exterior being open and the pores functioning normally, Summer Heat's obstruction of the exterior directly impairs the horse's ability to sweat. Forsythia Summer Heat addresses this mechanism by clearing the Summer Heat pathogen, resolving the associated Heat toxin and Dampness, and opening the exterior to restore normal pore function.
For the traditional powder, administer two tablespoons twice daily for the first 20 days, then two tablespoons once daily. For the Flax Plus format, administer one scoop (six-tablespoon scoop included) twice daily for the first 20 days, then one scoop daily. Mix into grain for easy administration. If the horse is reluctant to eat herbs, begin with small amounts in grain and gradually increase, or choose the Flax Plus version. Confirm dosing for horses of other weights with your authorizing veterinarian. Not for use in pregnant mares.
Because Summer Heat is a season-specific pathogen in TCVM, Forsythia Summer Heat is most appropriately administered during warm-weather periods when Summer Heat conditions are present. Many practitioners recommend beginning the formula as warm weather arrives and the horse first shows signs of reduced or absent sweating, continuing through the hot season, and reassessing as temperatures cool. The loading dose of twice daily for the first 20 days is appropriate for the initial treatment period or when Summer Heat conditions are most intense; the maintenance dose of once daily can continue through the season as needed. Your authorizing veterinarian can guide the optimal start timing, seasonal dosing schedule, and reassessment based on your horse's climate and response.
Forsythia Summer Heat is intended to support anhidrosis management as part of a comprehensive approach under veterinary supervision, and can generally be used alongside other supportive measures your veterinarian recommends, including environmental management, electrolyte supplementation, and exercise modification. Response time varies by individual horse and the severity of the Summer Heat pattern; some horses show improvement in sweating capacity within 2 to 4 weeks of consistent use during the loading phase, while others may require a full season of consistent use. Because anhidrosis is a serious thermoregulatory condition, all horses using this formula should remain under active veterinary monitoring throughout the treatment period to ensure safety and evaluate response.
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