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Herbsmith Rx Bu Gan San is a classical Chinese herbal formula recommended by holistic veterinarians to tonify and regulate the blood and nourish the liver yin in dogs, cats, and horses. Also known as Tonify the Liver Powder, Liver Support Formula, and Rehmannia and Peony Combination, Bu Gan San is a seven-herb formula built around the Si Wu Tang (Four Substance Decoction) blood-nourishing core - Dang Gui, Chuan Xiong, Bai Shao, and Shu Di Huang - extended with Suan Zao Ren, Mu Gua, and Zhi Gan Cao to address the liver blood and yin vacuity pattern comprehensively. The formula's primary therapeutic logic centers on the TCVM understanding that the liver stores the blood and is nourished by the blood: when liver blood and yin are insufficient, the liver loses the moistening and nourishing it requires to maintain its free-flowing and harmonizing function, generating a cascade of downstream signs including tendon and sinew malnourishment, spirit and sleep disturbance, visual dimness, dry and brittle nails and hair coat, and the liver-specific pattern of deficient blood failing to anchor the liver yang and producing mild upward disturbance. Bu Gan San's seven herbs address the liver blood and yin vacuity from three simultaneous directions: powerfully nourishing and generating the liver blood and yin from the blood level (Shu Di Huang, Dang Gui, Bai Shao, Suan Zao Ren); moving and regulating the blood to prevent the nourishing herbs from generating stagnation (Chuan Xiong, Dang Gui); and relaxing and moistening the sinews and channels that liver blood vacuity is failing to nourish (Mu Gua, Bai Shao, Zhi Gan Cao). Well suited for dogs, cats, and horses presenting with liver blood and yin vacuity, characterized by chronic fatigue and general debility from blood vacuity failing to nourish and energize the body; tendon, sinew, and musculoskeletal stiffness or cramping from liver blood vacuity failing to moisten and relax the sinews; a dull, poor, or dry hair coat and brittle nails from blood vacuity failing to nourish the liver's external manifestations; restlessness, disturbed sleep, or anxious behavior from blood vacuity failing to anchor and calm the liver spirit; visual dimness or reduced visual acuity from liver blood vacuity failing to nourish the eyes, which the liver opens into; a pale or pale-lavender tongue with a thin coating and a fine, wiry, or choppy pulse reflecting the blood vacuity (pale, fine) and the liver's compromised free-flowing function (wiry, choppy). Available as a concentrated powder mixed into food; dogs and cats 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.
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
What It Supports
- Liver blood and yin nourishment through Shu Di Huang as the principal blood and yin tonic: Powerfully nourishes the liver and kidney yin and blood, replenishes the essence (jing), and provides the constitutional yin and blood foundation from which the formula's entire nourishing strategy draws its deepest replenishment through Shu Di Huang (prepared rehmannia root, Radix Rehmanniae Glutinosae Conquitae), the chief yin and blood tonic of Bu Gan San. Shu Di Huang's sweet, slightly warm, and heavy nature enters the liver, kidney, and heart channels at the deepest constitutional level, nourishing the blood and yin from the essence level and providing the substantial replenishment that the formula's lighter blood-nourishing herbs build upon. Shu Di Huang's heavy, cloying nature warrants caution in animals with significant dampness, phlegm, or spleen qi weakness.
- Blood nourishment and activation through Dang Gui as the essential dual-action nourishing and moving herb: Nourishes and activates the blood, moistens the intestines, and addresses secondary blood stagnation through Dang Gui (angelica root, Radix Angelicae Sinensis). Dang Gui's sweet, acrid, and warm nature enters the liver, heart, and spleen channels to nourish liver blood while activating and moving it, ensuring the formula's powerful nourishing herbs are accompanied by the movement needed to prevent the restored blood from becoming stagnant. Dang Gui has mild anticoagulant effects from its coumarin content; when combined with Chuan Xiong, this compounded anticoagulant interaction requires veterinary coordination in animals on anticoagulant medications.
- Liver yin nourishment, liver yang anchoring, and sinew relaxation through Bai Shao: Nourishes the liver yin and blood, anchors the liver yang, softens the liver, relieves cramping and spasm, and clears vacuity heat through Bai Shao (white peony root, Radix Paeoniae Lactiflorae). Bai Shao's sour, bitter, and slightly cold nature enters the liver and spleen channels to nourish the liver yin, anchor the yang, and soften and relax the sinews and tendons that liver blood vacuity is failing to moisten. In TCVM, the liver governs the sinews: when liver blood is sufficient, the sinews are supple and freely movable; when liver blood is vacuous, the sinews become stiff, cramped, and prone to spasm. Bai Shao works with Mu Gua and Zhi Gan Cao to form the formula's sinew-relaxing triad. Bai Shao has mild antiplatelet effects from its paeoniflorin content; monitoring is warranted in animals on anticoagulant medications.
- Blood activation and qi movement through Chuan Xiong preventing stagnation from the heavily nourishing herbs: Activates the blood, moves the qi, dispels wind, and prevents blood stagnation through Chuan Xiong (ligusticum root, Radix Ligustici Chuanxiong), the formula's primary blood-activating and qi-moving herb. Chuan Xiong's acrid, warm nature enters the liver, gallbladder, and pericardium channels to move qi and blood simultaneously, transforming the nourished, replenished blood from a static pool into a freely circulating vital substance. Combined with Dang Gui and Bai Shao, the formula's three blood-activating herbs create a compounded anticoagulant and antiplatelet interaction concern in animals on anticoagulant medications requiring veterinary coordination.
- Heart blood nourishment and spirit calming through Suan Zao Ren addressing the restlessness and disturbed sleep of liver-heart blood vacuity: Nourishes the heart blood and liver blood, calms the spirit, generates fluids, and addresses restlessness, disturbed sleep, and anxious behavior through Suan Zao Ren (sour jujube seed, Semen Zizyphi Spinosae). The liver stores the blood at rest and releases it to the heart for circulation; when liver blood is vacuous, the heart receives insufficient blood to nourish the spirit, generating the restlessness and disturbed sleep of the liver-heart blood vacuity pattern. Suan Zao Ren's sedative and anxiolytic properties from its jujuboside and spinosin content warrant monitoring in animals on sedative, anxiolytic, or central nervous system-modulating medications.
- Sinew relaxation and dampness transformation through Mu Gua targeting the musculoskeletal stiffness of liver blood vacuity: Relaxes the sinews and tendons, transforms dampness, harmonizes the stomach, and relieves cramping and stiffness through Mu Gua (Chinese quince fruit, Fructus Chaenomelis Lagenariae). Mu Gua's sour and warm nature enters the liver and spleen channels to relax the sinews from the liver channel perspective, targeting the tendon and sinew stiffness and cramping that liver blood vacuity produces when the failing blood can no longer keep the sinews supple. Mu Gua is generally well tolerated; its warm nature warrants monitoring in animals with significant internal heat or yin vacuity dryness.
- Formula harmonization and sinew-cramping relief through Zhi Gan Cao working with Bai Shao as the classical Shao Yao Gan Cao Tang sinew-cramping pair: Harmonizes the formula, tonifies the spleen qi and middle jiao, moderates the stagnation-generating tendency of the heavy nourishing herbs, and works with Bai Shao as the classical Shao Yao Gan Cao Tang sinew-cramping relief pair through Zhi Gan Cao (honey-fried licorice root, Honey-fried Radix Glycyrrhizae Uralensis). The honey-fried preparation enhances its spleen qi-tonifying and middle jiao-moistening action, providing digestive protection and harmonization in a formula whose heavy nourishing herbs could generate middle jiao stagnation without this moderating presence. Zhi Gan Cao at sustained doses has pseudoaldosteronism-like interaction potential with corticosteroids and diuretics.
TCVM Principles
- Primary action - liver blood and yin vacuity through the Si Wu Tang blood-nourishing core extended with spirit-calming, sinew-relaxing, and harmonizing herbs: Addresses the liver blood and yin vacuity pattern through the foundational Si Wu Tang (Four Substance Decoction) blood-nourishing strategy extended with Suan Zao Ren for spirit and sleep disturbance from heart-liver blood vacuity, Mu Gua for sinew and musculoskeletal stiffness from liver blood failing to nourish the sinews, and Zhi Gan Cao for harmonization and sinew-cramping relief in coordination with Bai Shao. The formula's therapeutic logic reflects the TCVM understanding that the liver stores the blood and is nourished by the blood: when liver blood is sufficient the liver performs all its governing functions (storing blood, ensuring free flow, governing the sinews, opening into the eyes, manifesting in the nails, housing the hun spirit); when liver blood is vacuous each of these functions is progressively compromised. Bu Gan San addresses the liver blood vacuity root (Si Wu Tang core) while simultaneously targeting the most clinically significant downstream manifestations.
- Secondary action - distinguishing liver blood vacuity from liver qi stagnation, liver yang hyperactivity, liver fire, and damp-heat patterns requiring different therapeutic strategies: Bu Gan San is indicated specifically for liver blood and yin vacuity, not for liver qi stagnation (which requires qi-moving and constraint-relieving herbs such as Chai Hu, Xiang Fu, and Zhi Ke), liver yang hyperactivity (which requires yang-anchoring and constitutional yin-nourishing herbs), liver fire (which requires bitter-cold heat-clearing herbs), or damp-heat in the liver and gallbladder (which requires damp-heat-clearing and bile-regulating herbs). Clinical differentiation centers on characteristic nourishment-failure signs (pale tongue, fine pulse, dry hair coat, tendon stiffness, visual dimness, disturbed sleep) without the excess-heat tongue coating, full pulse, or strong qi-stagnation signs of excess liver patterns. Your authorizing veterinarian will confirm the pattern through tongue and pulse examination.
Available Forms
- Powder - Canine Blend (for dogs and cats): Available in 75 g, 150 g, 500 g, 900 g, and 1200 g sizes; mix into food at the recommended dose for your pet's weight. Cats and dogs both use this blend.
- Powder - Equine/Horse Blend (for horses only): Available in 150 g, 500 g, 900 g, and 1200 g sizes; mix into grain at the recommended dose for your horse.
Suggested Use
For Dogs (Canine Blend Powder):
- Under 30 lbs: ½ tsp twice daily, or as prescribed
- 30-80 lbs: 1 tsp twice daily, or as prescribed
- 80-120 lbs: 1½ tsp twice daily, or as prescribed
- Over 120 lbs: 2 tsp twice daily, or as prescribed
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.
Ingredients
Active Ingredients: Dang Gui (Radix Angelicae Sinensis), Chuan Xiong (Radix Ligustici Chuanxiong), Bai Shao (Radix Paeoniae Lactiflorae), Shu Di Huang (Radix Rehmanniae Glutinosae Conquitae), Suan Zao Ren (Semen Zizyphi Spinosae), Mu Gua (Fructus Chaenomelis Lagenariae), Zhi Gan Cao (Honey-fried Radix Glycyrrhizae Uralensis)
Inactive Ingredient: Flaxseed
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
Active Ingredient TCVM Actions
Bu Gan San is a seven-herb formula built on the Si Wu Tang (Four Substance Decoction) blood-nourishing core - Shu Di Huang, Dang Gui, Bai Shao, and Chuan Xiong - extended with Suan Zao Ren for spirit calming, Mu Gua for sinew relaxation, and Zhi Gan Cao for harmonization and sinew-cramping relief:
- Shu Di Huang (Radix Rehmanniae Glutinosae Conquitae) - Prepared Rehmannia Root: Powerfully nourishes the liver and kidney yin and blood, replenishes the essence, and provides the deepest constitutional blood and yin nourishment from which the formula's entire replenishing strategy is sustained; the chief yin and blood tonic of Bu Gan San and the principal herb of the Si Wu Tang core. Its heavy, cloying nature warrants caution in animals with significant dampness or spleen qi weakness.
- Dang Gui (Radix Angelicae Sinensis) - Dong Quai / Chinese Angelica Root: Nourishes and activates the blood, regulates the channels, and moistens the intestines; provides the dual nourishing-and-moving action indispensable in every classical blood-nourishing formula. Mild anticoagulant effects from coumarin content; combined with Chuan Xiong and Bai Shao, monitoring is warranted in animals on anticoagulant medications.
- Bai Shao (Radix Paeoniae Lactiflorae) - White Peony Root: Nourishes the liver yin and blood, anchors the liver yang, softens the liver, and relieves sinew cramping and spasm; the liver-specific yin-nourishing and sinew-relaxing herb that addresses the tendon and musculoskeletal stiffness of liver blood vacuity directly. Works with Zhi Gan Cao as the classical Shao Yao Gan Cao Tang sinew-cramping pair and with Mu Gua as the formula's sinew-relaxing triad. Mild antiplatelet effects from paeoniflorin content.
- Chuan Xiong (Radix Ligustici Chuanxiong) - Ligusticum Root / Szechuan Lovage Root: Activates the blood, moves the qi, and dispels wind from the channels; the essential blood-activating and qi-moving component of the Si Wu Tang core that ensures nourished blood circulates through all channels and collaterals rather than pooling. Antiplatelet effects from ligustilide and ferulic acid content; veterinary coordination required in animals on anticoagulant medications.
- Suan Zao Ren (Semen Zizyphi Spinosae) - Sour Jujube Seed / Spiny Ziziphus Seed: Nourishes the heart blood and liver blood, calms the spirit, and generates fluids; the classical materia medica's most important single herb for the liver-heart blood vacuity pattern with spirit disturbance and insomnia. Sedative and anxiolytic properties from jujuboside and spinosin content; monitoring warranted in animals on sedative, anxiolytic, or central nervous system-modulating medications.
- Mu Gua (Fructus Chaenomelis Lagenariae) - Chinese Quince Fruit / Flowering Quince Fruit: Relaxes the sinews and tendons, transforms dampness, and harmonizes the stomach; works with Bai Shao and Zhi Gan Cao as the formula's sinew-relaxing triad targeting the tendon and muscle stiffness that liver blood vacuity generates. Generally well tolerated; warm nature warrants monitoring in animals with significant internal heat or yin vacuity dryness.
- Zhi Gan Cao (Honey-fried Radix Glycyrrhizae Uralensis) - Honey-fried Licorice Root: Harmonizes the formula, tonifies the spleen qi, moderates the stagnation-generating tendency of the heavy nourishing herbs, and works with Bai Shao as the classical Shao Yao Gan Cao Tang sinew-cramping pair. Pseudoaldosteronism-like interaction potential with corticosteroids and diuretics at sustained doses; veterinary review warranted.
Potential Drug Interactions
Bu Gan San's most significant drug interaction concern is the compounded anticoagulant and antiplatelet effect of its three blood-activating herbs: Dang Gui's coumarin-based anticoagulant effects, Chuan Xiong's ligustilide and ferulic acid antiplatelet effects, and Bai Shao's paeoniflorin antiplatelet effects combine to create a meaningful anticoagulant interaction risk in animals on warfarin, heparin, aspirin, clopidogrel, and other anticoagulant or antiplatelet medications. This combined blood-activating interaction is the formula's primary drug interaction category and requires veterinary coordination before use in animals on any anticoagulant treatment. Suan Zao Ren's sedative and anxiolytic properties create a secondary interaction concern in animals on sedative medications, anxiolytics, phenobarbital, and other central nervous system-modulating treatments. Zhi Gan Cao at sustained doses has pseudoaldosteronism-like interaction potential with corticosteroids and diuretics. The formula's blood-nourishing and yin-moistening strategy is not appropriate for excess damp, phlegm-damp, or spleen yang vacuity cold patterns.
Medication categories warranting extra caution include anticoagulant and antiplatelet medications (compounded effects of Dang Gui, Chuan Xiong, and Bai Shao), sedative and anxiolytic medications and central nervous system modulators (Suan Zao Ren additive sedative effects), corticosteroids and diuretics (Zhi Gan Cao sustained-dose pseudoaldosteronism), and immunosuppressive or hepatically metabolized medications where Chuan Xiong's CYP interaction potential warrants review. Your authorizing veterinarian will determine appropriateness based on your animal's condition, current medications, and confirmation of the liver blood and yin vacuity pattern through tongue quality (pale or pale-lavender with thin coating), pulse character (fine, wiry, or choppy), and clinical assessment.
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
Frequently Asked Questions
What conditions is Bu Gan San used for in TCVM?
In Traditional Chinese Veterinary Medicine, Bu Gan San is indicated for the liver blood and yin vacuity pattern, where insufficient liver blood and yin compromise the liver's capacity to nourish its governed tissues and anchor its yang and spirit. The clinical presentation centers on the combination of chronic fatigue and general debility; tendon, sinew, and musculoskeletal stiffness or cramping from liver blood failing to moisten and nourish the sinews; a dull or dry hair coat and brittle nails from blood vacuity failing to nourish the liver's external manifestations; restlessness, disturbed sleep, or anxious behavior from blood vacuity failing to anchor the heart-liver spirit; visual dimness from liver blood failing to nourish the eyes; and a pale tongue with thin coating and a fine, wiry, or choppy pulse. Your authorizing veterinarian will confirm the pattern through tongue and pulse examination and clinical assessment.
How is Bu Gan San administered to dogs, cats, and horses?
Mix the powder directly into food or grain at the dose recommended for your animal's species and body weight. Dogs and cats use the Canine Blend; horses use the Equine/Horse Blend. All species receive the formula twice daily, with horses following the standard 20-day twice-daily loading protocol before transitioning to once-daily maintenance dosing. Because Bu Gan San contains three herbs with anticoagulant and antiplatelet effects (Dang Gui, Chuan Xiong, Bai Shao) and Suan Zao Ren with sedative properties, comprehensive veterinary review of current medications is required before use. The formula's yin-nourishing and blood-nourishing strategy is not appropriate for animals with significant dampness, phlegm, or spleen yang vacuity cold.
How long does it take to see results with Bu Gan San?
As a formula addressing a chronic constitutional blood and yin vacuity pattern, Bu Gan San requires a sustained treatment course to meaningfully restore the liver blood and yin. Early improvement in the most responsive signs (reduced restlessness, improved sleep quality, mild improvement in energy) may be seen within 2 to 4 weeks. More substantial restoration, reflected in improved hair coat quality, progressive reduction in tendon and sinew stiffness, and normalization of the tongue color from pale toward pink, typically requires 4 to 8 weeks or longer. Deeply established liver blood and yin vacuity may require 3 to 6 months of sustained treatment. Your authorizing veterinarian will monitor tongue, pulse, and clinical signs throughout the treatment course.
How does Bu Gan San relate to Si Wu Tang, and why does it include Suan Zao Ren and Mu Gua in addition to the Four Substance Decoction core?
Bu Gan San is built on the Si Wu Tang (Four Substance Decoction) core - Shu Di Huang, Dang Gui, Bai Shao, and Chuan Xiong - the most foundational blood-nourishing formula in classical TCVM. Si Wu Tang alone addresses blood vacuity at the blood level; Bu Gan San extends this core with three additional herbs that target the specific downstream consequences of liver blood vacuity that Si Wu Tang alone does not fully address. Suan Zao Ren addresses the heart-liver blood vacuity pattern with spirit disturbance: when liver blood is insufficient, the heart shen loses nourishment and becomes restless, and Suan Zao Ren nourishes both the heart and liver blood channels simultaneously to calm the spirit at its blood-nourishment root. Mu Gua specifically relaxes and moistens the sinews and tendons that liver blood vacuity is failing to nourish, targeting the musculoskeletal stiffness that is one of the most clinically prominent signs in animals. Together, Bu Gan San provides a more complete clinical response to the liver blood and yin vacuity pattern by addressing the spirit, sinew, and musculoskeletal dimensions alongside the foundational blood nourishment.
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