Li Zhi He (荔枝核; Lì Zhī Hé; Latin: Litchi Semen; English: lychee seed) is the dried ripe seed of the lychee tree, collected in summer when the fruit is ripe, with the flesh removed and the seed washed and dried. Common forms include the raw seed and the salt-processed seed, which leans more toward the Kidney channel. It is sweet and slightly bitter, warm, enters the Liver and Kidney channels, and its core actions are to move qi and disperse lumps, and to scatter cold and stop pain. It is hard, so it is usually crushed before decocting or soaked in boiling water first, with no special "decoct first" or "add later" step. The usual amount is 5–10 g. Food-style use is about 2–5 g per time, smaller than the medicinal dose.
It is not Ju He. Ju He is neutral and bitter, enters only the Liver channel, and simply regulates qi to disperse lumps, with no cold-scattering action. Li Zhi He is slightly warm, also reaches the Kidney, and both moves qi and warms away lower-body cold. It is not a generic pain pill. People with yin-deficiency heat — a red tongue with little coating, dry mouth and throat — should not self-use, or the warmth adds dry heat. Excess heat, with a bitter dry mouth and bound stools, is a poor match. Use caution in pregnancy. Do not keep brewing it for a long course.
It is used most often for three patterns:
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Qi stagnation pain — bloated full stomach, tender ribs, hernia-type pain, worse with emotional strain or cold
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Cold hernia and testicular heaviness — lower-belly cold pain, heavy achy testicles — seek care
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Women's cold-and-stuck pain — menstrual pain, postpartum abdominal pain — seek care
Sweet, slightly bitter, and warm, it is not a daily "qi-moving seed" to keep adding. Where there is no cold-and-stuck pattern, moving freely consumes qi and dryness builds up.
When cold congeals below and liver-qi is stuck, the lower belly feels cold and tight, pain worsens in the cold, and menstrual or hernia ache follows. Li Zhi He is sweet, slightly bitter, and warm. It moves qi, scatters cold, and eases pain, which is why it appears in Li Ju Xiang San–type formulas and Li Zhi San–type formulas. It moves more than it tonifies. A yin-deficient, heat-dried constitution, with no cold pattern, gets worse if more is added.
Li Zhi He is not a catch-all qi-moving or pain seed. In yin-deficiency heat, excess heat, or pregnancy, using it alone is a poor match. Whether it belongs in a formula, and at what dose, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.