Huǒ Má Rén (火麻仁) — Hemp Seed

On this page

1. Overview
2. Properties
3. Actions and indications
4. Key formulas
5. Modern research
6. Cautions and contraindications
7. Treatment at my clinic

1. Overview

Huǒ Má Rén (火麻仁) is the ripe, dehulled seed of Cannabis sativa, known in English as hemp seed. It belongs to the category of Moistening laxative herbs that drain downward in the Chinese Materia Medica and is one of the safest and most widely used gentle laxative herbs in Chinese herbal medicine — particularly suited to dry constipation in the elderly, after illness, and in patients with deficient Yin or Blood.

Hemp seed has essentially no psychoactive activity: the THC-bearing parts of the plant are the female flowers and leaves, not the seed, and culinary and herbal-grade hemp seed is fully legal in the UK and Europe. The seed used herbally is the same as the hemp seed widely sold as food.

I prescribe Huǒ Má Rén as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan — independently tested to the highest international quality and safety standards. Herbs are always combined with other herbs selected to match the patient’s individual TCM pattern. Online consultations are available for patients who cannot attend my clinic in person.

2. Properties

3. Actions and indications

Principal actions

1. Moistens the Intestines and unblocks the bowels
2. Nourishes Yin and supplements the Blood

Indications

1. Dry, hard-stool constipation in older adults, post-partum and post-illness patients
2. Constipation in Yin or Blood deficiency, where stronger purgatives would damage the upright Qi
3. Habitual dry constipation in those who cannot tolerate strong laxatives

4. Key formulas containing Huǒ Má Rén

Huǒ Má Rén is the chief herb in Ma Zi Ren Wan (Hemp Seed Pill), the classical formula for dry constipation with mild heat in the intestines. It is also used in moistening combinations alongside Tao Ren (peach kernel), Yu Li Ren and Dang Gui.

5. Modern research

Hemp seed is rich in oils (around 30%), high-quality protein, fibre and minerals. The oil profile is favourable, with linoleic acid (omega-6) and alpha-linolenic acid (omega-3) in a ratio close to the dietary ideal, plus gamma-linolenic acid. Research supports the seed's lipid-modulating and laxative effects, and clinical trials of Ma Zi Ren Wan in functional constipation report meaningful benefit with a favourable side-effect profile compared with stimulant laxatives. THC content of properly processed hemp seed is negligible.

6. Cautions and contraindications

Use with caution in patients with chronic loose stools or Spleen-deficient diarrhoea. Excessive doses can cause cramping and loose stools. In line with the British Pharmacopoeia and food-supplement standards, only dehulled hemp seed from a reputable supplier should be used. There is no psychoactive effect at therapeutic doses; the THC content of properly processed seed is below detection thresholds.

Important: Chinese herbs should always be prescribed by a fully qualified herbalist who is a member of the Register of Chinese Herbal Medicine (RCHM). Never self-prescribe or self-administer Chinese herbs without professional guidance. Dr (TCM) Attilio D’Alberto is a member of the RCHM and the British Acupuncture Council with over 25 years of clinical experience.

7. Treatment at my clinic

I prescribe Huǒ Má Rén as part of tailored herbal formulas for chronic dry constipation, particularly in older adults, in postnatal patients and in patients with Yin or Blood deficiency. Every prescription is individually formulated following a full TCM assessment.

I see patients in person at my clinic in Wokingham, Berkshire. Online Chinese herbal medicine consultations are available for patients throughout the UK and internationally, with herbs dispensed by post. Visit the prices page for consultation fees.

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Prefer to be treated from home? Chinese herbal medicine online consultations are available throughout the UK and worldwide. After a full video consultation, Dr (TCM) Attilio D'Alberto formulates a bespoke herbal prescription and posts your Chinese herbs directly to your door.