Flex (Heat)™

TCM herbal formula for hot arthritis, gout, rheumatoid arthritis, and fibromyalgia with inflammation — analgesic; anti-inflammatory; antirheumatic; immunomodulatory; immunosuppressive; chondroprotective; osteogenic; expels wind and heat; clears damp-heat; disperses painful obstruction

⚠️ Contraindicated during pregnancy and nursing. Contains Dang Gui Wei (Extremitas Radix Angelicae Sinensis), which invigorates blood circulation — patients on anticoagulant or antiplatelet therapies such as Coumadin (warfarin) should use with caution or not at all due to higher risk of bleeding and bruising. Do not use if arthritis worsens with cold and rainy weather — use Flex (CD) instead. Do not use heat packs for joint pain due to heat. Rule out internal hemorrhage before treating patients with head injuries.

CLINICAL APPLICATIONS

* Acute muscle aches and pain with heat manifestations — swelling, burning sensation, and inflammation

* Acute re bi (heat painful obstruction), arthritis, arthralgia, or gout with redness and swelling

* Fibromyalgia with heat manifestations

* Rheumatic heat disorders

Background: Musculoskeletal and connective tissue disorders are major causes of pain and physical disability. Simple causes include trauma and external injuries (pulled muscles, strained ligaments, dislocated joints, bone fractures); complicated causes include infection, autoimmune disorders, crystal-induced inflammation, and non-inflammatory tissue degeneration. Optimal treatment must address the symptoms (pain and inflammation) and the underlying causes. After the disorder is stabilized, physical therapy and exercise are important to maintain flexibility and strengthen surrounding muscles.

Flex (Heat) vs. Flex (CD): Flex (Heat) is for arthritis and joint pain with heat signs — redness, burning, swelling, and inflammation. Flex (CD) is for arthritis and joint pain that worsens with cold and damp weather. Use ice packs (not heat packs) with Flex (Heat). Use heat pads (not ice packs) with Flex (CD).

Based on: Er Miao San (Two-Marvel Powder) — the classical formula for damp-heat in the lower body (Cang Zhu + Huang Bo).

Key herb-level clinical data:

— Cang Zhu (Rhizoma Atractylodis / Atractylodes): dries dampness; combined with Huang Bo as Er Miao San — excellent effect to treat pain in the lower half of the body

— Huang Bo (Cortex Phellodendri Chinensis / Phellodendron): clears damp-heat in the lower body; anti-inflammatory — inhibits IL-1β and TNF-α production in a dose-dependent manner (NF-κB pathway); gout — reduces serum uric acid levels and inhibits liver xanthine oxidase activity

— Zhi Mu (Rhizoma Anemarrhenae / Anemarrhena): anti-inflammatory — clears heat; reduces painful swelling of joints; inhibits COX-2, iNOS, and 5-lipoxygenase; osteoprotective — steroidal saponins suppress bone mineral density loss and promote bone formation (ovariectomy-induced bone loss model); clinically: rheumatism — 56 patients, 71.4% effective

— Qiang Huo (Rhizoma et Radix Notopterygii / Notopterygium): antirheumatic, anti-inflammatory, and analgesic — expels wind, damp, and heat in the upper body; removes painful obstruction; inhibits 5-lipoxygenase and COX

— Du Huo (Radix Angelicae Pubescentis / Angelica Pubescens): antirheumatic, anti-inflammatory, and analgesic — expels wind, damp, and heat in the lower body; removes painful obstruction

— Sang Zhi (Ramulus Mori / Mulberry Twig): antirheumatic, anti-inflammatory, and analgesic — expels wind, damp, and heat in both upper and lower body; removes painful obstruction

— Shi Gao (Gypsum Fibrosum / Gypsum): anti-inflammatory — clears heat; reduces painful swelling sensation of the joints

— Yi Yi Ren (Semen Coicis / Coix / Job's Tears): diuretic — reduces swelling of the joints

— Fang Ji (Radix Stephaniae Tetrandrae / Stephania): diuretic — reduces swelling of the joints; antirheumatic and immunomodulatory — reduces collagen-induced arthritis in vivo; clinically: rheumatoid arthritis — 12 weeks of treatment suppresses excessive granulocyte activation and reduces inflammation

— Wei Ling Xian (Radix et Rhizoma Clematidis / Clematis): antirheumatic and antiarthritic — clears channels and collaterals; enhances joint flexibility and integrity; inhibits pro-inflammatory compounds and prevents rheumatoid arthritis; chondroprotective — inhibits MMP-3, MMP-13, and COX-2; prevents extracellular matrix degradation and cartilage erosion in osteoarthritis

— Luo Shi Teng (Caulis Trachelospermi / Trachelospermum / Star Jasmine): antirheumatic and blood-invigorating — clears channels and collaterals; enhances joint flexibility and integrity; dredges channels; scours residual blood stagnation; used in wind disorders including paralysis and hemiplegia

— Dang Gui Wei (Extremitas Radix Angelicae Sinensis / Angelica Sinensis Tail): antirheumatic and blood-invigorating — clears channels and collaterals; analgesic and anti-inflammatory — inhibits NO and PGE2; anti-inflammatory 1.1× stronger than aspirin; analgesic 1.7× stronger than aspirin; osteogenic — stimulates type I collagen synthesis and proliferation of osteoprecursor cells

— Xi Xian Cao (Herba Siegesbeckiae / Siegesbeckia): analgesic and anti-inflammatory — inhibits NO, PGE2, TNF-α, COX-2, and iNOS (NF-κB pathway); dredges channels; scours residual blood stagnation; used in wind disorders including paralysis and hemiplegia; immunosuppressive — inhibits both cellular and humoral immunity; treats joint disorders due to autoimmune disease; chondroprotective — promotes proteoglycan, aggrecan, and type II collagen expression in collagenase-induced osteoarthritis

— Lu Lu Tong (Fructus Liquidambaris / Liquidambar / Sweetgum): dredges channels; scours residual blood stagnation; used in wind disorders including paralysis and hemiplegia

— Qin Jiao (Radix Gentianae Macrophyllae / Gentiana Macrophylla): dredges channels; scours residual blood stagnation; antirheumatic, anti-inflammatory, and analgesic

— Wu Jia Pi (Cortex Acanthopanacis / Acanthopanax / Eleuthero Bark): strengthens sinews and bones; relieves chronic pain

WESTERN THERAPEUTIC ACTIONS

* Analgesic — Qiang Huo (muscle aches and pain); Dang Gui Wei (1.7× aspirin); Xi Xian Cao; Zhi Mu (osteoarthritis)

* Anti-inflammatory — Zhi Mu (COX-2↓, iNOS↓, 5-LO↓); Huang Bo (IL-1β↓, TNF-α↓, NF-κB↓); Qiang Huo (5-LO↓, COX↓); Dang Gui Wei (NO↓, PGE2↓, 1.1× aspirin); Xi Xian Cao (NO↓, PGE2↓, TNF-α↓, COX-2↓, iNOS↓, NF-κB↓); Shi Gao (heat↓, swelling↓)

* Antirheumatic / antiarthritic — Du Huo + Sang Zhi (wind-damp-heat obstruction); Qiang Huo (upper body); Wei Ling Xian (rheumatoid arthritis prevention); Fang Ji (collagen-induced arthritis, granulocyte suppression)

* Immunomodulatory / immunosuppressive — Fang Ji (rheumatoid arthritis, 12 weeks); Xi Xian Cao (cellular and humoral immunity↓, autoimmune joint disorders)

* Chondroprotective — Wei Ling Xian (MMP-3↓, MMP-13↓, COX-2↓, extracellular matrix protection); Xi Xian Cao (proteoglycan↑, aggrecan↑, type II collagen↑)

* Osteogenic / osteoprotective — Dang Gui Wei (type I collagen↑, osteoprecursor cell proliferation↑); Zhi Mu (bone mineral density↑, bone formation↑)

* Anti-gout — Huang Bo (serum uric acid↓, xanthine oxidase↓)

CHINESE THERAPEUTIC ACTIONS

* Expels wind and heat; removes painful obstruction (Qiang Huo, Du Huo, Sang Zhi)

* Clears damp-heat; reduces swelling (Cang Zhu, Huang Bo — Er Miao San; Yi Yi Ren, Fang Ji)

* Clears heat; reduces painful swelling of joints (Shi Gao, Zhi Mu)

* Antirheumatic; blood-invigorating; clears channels and collaterals (Wei Ling Xian, Luo Shi Teng, Dang Gui Wei)

* Dredges channels; scours blood stagnation; treats wind disorders (Xi Xian Cao, Lu Lu Tong, Qin Jiao)

* Strengthens sinews and bones; relieves chronic pain (Wu Jia Pi)

DOSAGE

Standard: 3–4 capsules three times daily on an empty stomach with warm water. Severe pain: 5–6 capsules every 4–6 hours as needed.

Clinical notes: Can be combined with Flex (TMX) in the early stages of sports injuries when there is severe pain with inflammation, swelling, and redness — begin treating immediately for maximum effectiveness. Use ice packs (not heat packs) to reduce redness, swelling, and inflammation.

Supplementary formulas: Enhanced analgesia — add Herbal ANG. Severe inflammation — combine with Astringent Complex. Excess heat — add Gardenia Complex. Severe pain with blood stagnation — add Circulation (SJ). Gout — use Flex (GT) instead. Neck and shoulder pain — add Neck & Shoulder (AC) or Neck & Shoulder (CR). Lower back pain — add Back Support (AC) or Back Support (CR). Herniated disk with swelling and inflammation — add Back Support (HD). Knee pain — add Knee & Ankle (AC) or Knee & Ankle (CR). Spasms and cramps — combine with Flex (SC). Bone fractures, injuries, and bruises — combine with Flex (TMX). Bone spurs — add Flex (SPR). Post-stroke numbness and atrophy — use Neuro Plus. Osteoporosis — add Osteo 8. Muscle, ligament, and tendon degeneration — add Flex (MLT). Cold-type arthritis worsening with cold and rain — use Flex (CD) instead.

Nutrition: Sulfur helps calcium absorption — essential for repair and rebuilding of bones, tendons, cartilage, and connective tissues; eat foods high in sulfur such as asparagus, eggs, fresh garlic, and onions. Histidine (an amino acid) removes excess copper and iron found in arthritic patients — eat foods high in histidine such as rice, wheat, and rye. Fresh pineapple contains bromelain — excellent for reducing inflammation. Increase intake of nourishing, cooling foods such as Mexican yam, yam, radishes, potatoes, carrots, melons, cucumbers, beets, turnips, malanga, celeriac, taro, and rutabaga. Avoid spicy food, caffeine, citrus fruits, sugar, milk, dairy products, and red meat. Fish oil may help alleviate pain associated with rheumatoid arthritis — can be taken alongside the herbs. Decrease sour foods, drinks, and citrus — their constricting nature may contribute to further stagnation in the channels and collaterals. Avoid spicy, pungent, and aromatic vegetables such as pepper, garlic, onions, basil, rosemary, cumin, fennel, anise, leeks, chives, scallions, thyme, mustard, chili pepper, and wasabi.

Tao of Nutrition (Dr. Maoshing Ni and Cathy McNease): Recommended foods: plenty of fresh fruits and vegetables, dandelion, cabbage, mung beans, winter melon, and soybean sprouts. Apply poultices of crushed dandelion greens, changing every two hours. Avoid spicy foods, green onions, alcohol, smoking, and all types of stress.

Lifestyle: For overweight patients, weight loss is suggested — lessens pressure on joints and helps relieve pain.

CASE STUDIES

— 85-year-old female: Severe right toe pain with difficulty walking; BP 140/90, HR 76; damp-heat arthritis (TCM); uric acid buildup (Western). Flex (Heat) 4 capsules 3x/day for 2 weeks + Zheng Gu Shui topically to big toe + distilled water + pure cherry juice + no alcohol. Result: improvement after a few days; completed full course.

— 54-year-old female (E.K.): Severe burning sacral pain; MRI showed bulging lumbar disc; first time experiencing burning sensation on top of chronic low back pain; heat in lower jiao (TCM). Flex (Heat) 4 capsules 4x/day. Result: burning sensation resolved; pain not completely resolved; used formula intermittently when burning sensation returned.

— Female broker: Joint pain, heat, and swelling flaring intermittently; limited ROM; joint rigidity; fourth finger bilaterally and ankles; butterfly rash (yin deficiency); hot flashes and night sweats; bi zheng due to wind-damp-heat with underlying Kidney yin deficiency. Flex (Heat) + Zhi Bai Di Huang Wan (Anemarrhena Phellodendron and Rehmannia Formula). Result: best results compared to previous medications; maintained therapeutic value for almost a year (vs. 4–6 months with prior treatments); practitioners noted Flex (Heat) as very effective for inflammatory joint conditions.

Related Reading

Also see: Flex (CD) – for cold-type arthritis worsening with cold and damp | Flex (GT) – specifically for gout | Astringent Complex – for severe inflammation | Gardenia Complex – for excess heat | Back Support (AC) – for acute back pain | Back Support (HD) – for herniated disc | Neck & Shoulder (AC) – for acute neck and shoulder pain | Knee & Ankle (AC) – for acute knee pain | Flex (TMX) – for traumatic injuries | Flex (SC) – for spasms and cramps | Osteo 8 – for osteoporosis | Herbal ANG – to enhance analgesia | Circulation (SJ) – for blood stagnation pain | Pain Relief & Musculoskeletal Support Collection.