Ba Ji Tian (巴戟天) — Morinda Root | TCM Kidney Yang & Bi Syndrome Herb Guide

At a Glance

• Herb: Ba Ji Tian
• Chinese name: 巴戟天 (Bā Jǐ Tiān)
• Latin name: Morinda officinalis F.C. How
• Nature: Slightly Warm
• Taste: Sweet / Acrid
• Meridian: Kidney / Liver
• Category: Herbs that Tonify Yang
• Introduction: Ba Ji Tian (巴戟天), morinda root (Morinda officinalis), is a warming kidney yang tonic with a gentler, moister character than many of its counterparts — described as ‘温而不燥’ (warm without being drying). Entering the Liver and Kidney channels, it tonifies kidney yang, strengthens sinews and bones, and dispels wind-cold-damp — making it one of the few yang tonics with significant bi syndrome applications. This dual action (tonic + wind-damp dispersing) makes it especially useful for lower limb bi syndrome in elderly patients with underlying kidney deficiency. Its oligosaccharides (inulin-type fructans), anthraquinones, and iridoid glycosides provide antidepressant, anti-osteoporotic, and immunomodulatory effects.

Action

• Tonifies kidney yang (补肾阳): treats impotence, infertility, and urinary frequency from kidney yang deficiency — warm but not intensely drying.
• Strengthens sinews and bones (强筋骨): addresses lower back and knee weakness, sinew atrophy (痿证) from kidney deficiency.
• Dispels wind-cold-damp (祛风湿): treats cold-damp bi syndrome in the lower limbs — unique among yang tonics for this wind-damp action.
• Antidepressant action (解郁): oligosaccharides modulate HPA axis — used for kidney yang deficiency with depression and low motivation.

Clinical Application

• Impotence and male infertility: kidney yang deficiency — often combined with Yin Yang Huo.
• Female infertility: uterine cold and kidney yang deficiency with scanty cold periods.
• Lower back and knee pain: bi syndrome in elderly with kidney deficiency — cold-damp type with heaviness and stiffness.
• Leg weakness and atrophy (痿证): kidney yang deficiency with sinew weakness.
• Frequent urination and enuresis: kidney yang failing to consolidate.
• Depression with fatigue: kidney yang deficiency with low energy and mood.

Precautions

• Yin deficiency with heat: contraindicated — warm nature aggravates heat signs.
• Excess damp-heat: avoid in damp-heat bi syndrome — warming action worsens heat.
• Fire from deficiency: not suitable when there are night sweats and heat sensations without cold signs.
• Processing: salt-processed Ba Ji Tian (盐巴戟天) enhances kidney-directing action; wine-processed (酒巴戟天) improves wind-damp dispersing effect.
• Standard dose: 9–15g in decoction.

Formula

• 巴戟丸 (Ba Ji Wan): Ba Ji Tian + Rou Cong Rong + Tu Si Zi — kidney yang deficiency with impotence and lower back pain.
• 地黄饮子 (Di Huang Yin Zi): Ba Ji Tian + Rou Cong Rong + Shu Di + Fu Zi — kidney yang deficiency with aphasia and paralysis (wind strike pattern).
• 金刚丸 (Jin Gang Wan): Ba Ji Tian + Du Zhong + Niu Xi + Gou Ji — kidney-liver deficiency with leg weakness and difficulty walking.
• 右归丸 (You Gui Wan) variant: Ba Ji Tian substituted for deeper yang deficiency needing gentler warmth.

Combinations

• For kidney yang deficiency with impotence and cold lower back: combine with Yin Yang Huo, Du Zhong, Tu Si Zi.
• For wind-damp bi syndrome with weak lower limbs: combine with Du Huo, Niu Xi, Sang Ji Sheng.
• For uterine cold infertility: combine with Rou Gui, Wu Zhu Yu, Dang Gui.
• For kidney yang deficiency with frequent urination: combine with Yi Zhi Ren, Tu Si Zi, Fu Pen Zi.
• For depression from kidney yang deficiency: combine with Ren Shen, Rou Gui, Fu Zi.
• For premature ejaculation and nocturnal emission: combine with Shan Zhu Yu, Long Gu, Mu Li.
• For osteoporosis from kidney-liver deficiency: combine with Du Zhong, Xu Duan, Bu Gu Zhi.

Pharmacological Effects

• polysaccharides
  • Androgen-like: stimulate testosterone secretion and spermatogenesis
  • Immunomodulatory: enhance NK-cell and macrophage activity
• Adaptogenic
  • improves stress resistance and physical endurance
• Anti-osteoporosis
  • promotes osteoblast activity, inhibits osteoclast resorption
• iridoids
  • Antidepressant: modulate HPA axis and monoamine neurotransmitters
• monotropein
  • Anti-inflammatory: inhibits COX-2 and NF-κB pathways
• Memory-enhancing
  • improves cholinergic function and spatial memory

Classic Description

• Shen Nong Ben Cao Jing (《神农本草经》): ‘Governs great wind pathogen, impotence, strengthens sinews and bones, calms the five organs, supplements the center, increases the will, and benefits qi.’
• Ben Cao Gang Mu (《本草纲目》): ‘Treats leg qi, eliminates wind diseases, and supplements the blood sea.’
• Ben Cao Jing Shu (《本草经疏》): ‘Morinda Root governing great wind pathogen and wandering wind of the head and face: wind is a yang pathogen prone to moving upward; wherever pathogen concentrates, the qi there must be deficient — hence wind pathogen attacks it.’
• Ben Cao Zheng Yi (《本草正义》): ‘Morinda Root warms and nourishes original yang so that pathogenic qi is naturally eliminated; strengthening yin and benefiting essence weakens wind and dispels dampness.’