Seed

Mustard Seed

Brassica spp. / Sinapis alba

T Traditional use

A seed used as a spice and condiment. Crushed into a poultice, its warming effect is traditionally used for muscle and joint pain and chest colds.

Respiratory, Throat & MouthJoints, Bones & Pain
Mustard Seed – Seed

Image: Herbadex Botanik Stüdyosu · Özel Üretim

PregnancyCaution
BreastfeedingCaution
Children⚠ Avoid
Drug interactionsNo recorded interactions
⇄ Compare
On this page

At a glance

When mustard seed (yellow: Sinapis alba, black: Brassica nigra) is crushed and mixed with water, pungent isothiocyanates form. They redden and warm the skin, so mustard poultices are traditionally used for muscle and joint pain and chest colds. Because it can burn the skin, application time must be kept very short.

Parts used: seeds
Key constituents: Glucosinolates (Sinigrin, Sinalbin), Allyl Isothiocyanate (after crushing)

Updated: October 15, 2026

ℹ Compiled from standard pharmacognosy references and clinical literature summaries where no formal EMA monograph exists.

What is it used for?

  • T Traditional use

    Traditional use: Based on at least 30 years of documented traditional use rather than clinical trials.

    How do we rate evidence levels? →

    A mustard poultice is traditionally used for muscle and joint pain because of its warming effect. [2]

  • T Traditional use

    Traditional use: Based on at least 30 years of documented traditional use rather than clinical trials.

    How do we rate evidence levels? →

    A mustard poultice on the chest is traditionally used for colds and coughs. [2]

How is it used?

Topical

Mix ground seed with warm water into a paste, wrap in thin cloth and apply. Adults at most 10 minutes; 2–3 minutes the first time.

Amount: Once daily

Duration limit: 2 weeks

[2]

Food

Seeds and prepared mustard are used as a condiment.

Amount: In cooking

[2]

Safety & interactions

Minimum age: 6 years

  • Never place the paste directly on skin or leave it longer than advised: it can burn and blister.
  • Do not apply poultices on sensitive skin, over varicose veins or with kidney disease.
  • Do not use poultices on young children.
  • Mustard allergy can be serious; mustard is a declared allergen in Europe.
[2][1]

Drug interactions

No recorded interactions

Side effects

  • Skin redness, burning, blistering
  • Allergic reaction
  • Stomach irritation if eaten in large amounts

⚕ When to see a doctor

  • If high fever, shortness of breath or purulent/bloody phlegm develops
  • If symptoms do not improve within 1–2 weeks or worsen
  • If severe abdominal pain, jaundice, rash or allergic reaction occurs

Did you know?

Mustard's heat is not stored in the seed: an enzyme creates it within minutes once crushed seed meets water. [2]

Frequently asked questions

How is a mustard poultice made?

Mix ground seed with warm water, wrap in cloth and apply for at most 10 minutes.

Can a mustard poultice burn?

Yes, left too long it can burn and blister; watch the time.

Can mustard seed be eaten?

Yes, as a spice in food.

Sources

  1. EFSA Compendium of Botanicals Reported to Contain Naturally Occurring Substances of Possible ConcernEFSA · 2022
  2. Trease and Evans Pharmacognosy (16th Edition)Elsevier Health Sciences · 2009

Cite This Page

Mustard Seed (Brassica spp. / Sinapis alba). Herbadex — Doğal Şifa Rehberi (2026). https://herbadex.com/en/herb/mustard-seed/

Related guides and comparisons

Other herbs in the same preparation form (Seed)

Seed →
Chasteberry Seed
⚠ Avoid in pregnancy

Chasteberry Seed

A Strong clinical evidence

Vitex agnus-castus

Chasteberry dry extract may help with symptoms of premenstrual syndrome (PMS); regular use for 3 months is recommended for effect.

Women’s Health

Seed

Flaxseed – Seed
⚠ Avoid in pregnancy

Flaxseed

A Strong clinical evidence

Linum usitatissimum

Taken with plenty of liquid, flaxseed may help soften stools in habitual constipation; drinking enough fluid with it is essential.

Digestion

Seed