Sarshapa Taila (Mustard Oil): A Heating Massage Oil Under Regulatory Scrutiny

TL;DR

Sarshapa taila is the oil pressed from mustard seeds, in India mainly Brassica juncea. Ayurveda classifies it as heating, Kapha- and Vata-pacifying, and it is a traditional massage (abhyanga) oil. Modern concern centers on erucic acid: animal studies link it to cardiac fat deposits, and EFSA set a tolerable intake of 7 mg/kg body weight.

What it is

Sarshapa means mustard; taila means oil. India's dominant oilseed mustard is Brassica juncea (brown mustard), grown in the Indian subcontinent for oil production, alongside black mustard (B. nigra) and white mustard (Sinapis alba). The oil is distinct from mustard essential oil, which is the volatile allyl isothiocyanate fraction, not the pressed fat.

Traditional use

Mustard has been used in traditional medicine, internally and externally, "since eternal times," according to a 2021 toxicology review by the German Federal Institute for Risk Assessment. In South Asia, warm mustard oil is the near-universal newborn massage oil and a standard body-massage (abhyanga) oil. The pungency that gives mustard oil its sharp smell comes from isothiocyanates, the same chemistry behind traditional mustard plasters.

What modern research says

Erucic-acid toxicology (animal studies)

The BfR review finds that erucic acid, the main constituent of mustard seed lipids, causes myocardial lipidosis (fat deposits in heart muscle) in all animal species examined, the most sensitive effect of short-term exposure. EFSA's CONTAM panel set a tolerable daily intake of 7 mg/kg body weight in 2016 and considers the animal effect possibly relevant to humans, while noting that reliable human data on myocardial lipidosis are unavailable.

Regulatory status of expressed mustard oil

The US FDA's Import Alert 26-04 states that "expressed mustard oil is not permitted for use as a vegetable oil," because it may contain 20–40% erucic acid, "which has been shown to cause nutritional deficiencies and cardiac lesions." Regulatory limits on erucic acid in edible oils exist in multiple jurisdictions.

Newborn massage: mustard oil versus sunflower oil (cluster-randomized trial)

In Nepal, where mustard-oil newborn massage is almost universal, a community-based cluster-randomized trial followed 995 neonates massaged with mustard oil (standard practice) or sunflower oil for 28 days. Sunflower oil lowered skin pH faster in the first week. That was the only notable difference. There were no significant differences between the oils in erythema, rash, dryness, or transepidermal water loss, and no differences in skin infections by oil group. Animal models had suggested mustard oil could impair skin-barrier recovery, but this human trial found no clear harm signal, either.

What the evidence does not support (yet)

No human trial establishes that mustard-oil massage treats any disease or condition. The erucic-acid concern applies to ingestion as a food oil; it says nothing about external massage. And no clinical study supports therapeutic massage claims for this oil.

Safety & contraindications

The regulatory concern is ingestion: expressed mustard oil should not be consumed as a cooking or food oil in jurisdictions that restrict it. For external use, the pungent isothiocyanates are irritants, so avoid broken skin, mucous membranes, and contact with the eyes; people with mustard allergy must not use it. There are no safety data for internal medicinal use of sarshapa taila in children, pregnancy, or breastfeeding. Massage-oil use and food-oil use are different exposures, but neither carries proven therapeutic claims.

FAQs

What is sarshapa taila?

It is mustard oil, pressed mainly from Brassica juncea seeds in India. It is a traditional heating massage oil, distinct from volatile mustard essential oil.

Is mustard oil safe for cooking?

Not as expressed (pressed) oil in the US and several other jurisdictions: the FDA does not permit it as a vegetable oil because of erucic acid, which caused cardiac fat deposits and lesions in animal studies. Epidemiology has not shown a clear cardiac signal in humans from high-erucic diets.

Does mustard-oil massage have proven benefits?

No. The newborn-massage trial found no harm signal for mustard oil relative to sunflower oil, but it did not test therapeutic benefits, and no trial supports disease claims for mustard-oil massage.

Can newborns be massaged with mustard oil?

It is the traditional practice across South Asia, and the Nepal trial found no increase in skin infections versus sunflower oil. That is reassurance about safety in that setting, not an endorsement of benefit, and advice from a pediatrician still matters.

Why is this article short on research findings?

Because there are no clinical trials of sarshapa taila as a therapeutic agent. The strongest modern evidence concerns erucic-acid toxicology and the newborn-massage trial, both reported honestly here.

There is no validated human dose, internal or external, and this article omits dosage because no pharmacopoeial or clinical-trial citation supports one.

Sources

Disclaimer

This article is for education only and is not medical advice. Mustard oil's food-oil status is restricted in the US and elsewhere because of erucic acid; external massage use carries irritation and allergy cautions and has no proven therapeutic benefit. Consult a qualified practitioner or clinician before using it, especially for newborns or during pregnancy.