Soma Vriksha: Benefits, Uses & Dosage

If you have only ever met Bauhinia as an ornamental tree, this yellow-flowered cousin may surprise you. In Ayurveda it has a quiet but specific job: helping to resolve swellings and inflammation, especially the glandular kind.

Soma Vriksha (Somavriksha) is known in English as the Yellow Bauhinia or the St. Thomas Tree. Its botanical name is Bauhinia tomentosa Linn. In Hindi it is called Sonaji, and one of its Sanskrit synonyms, Pitakanchanara (Pitakanchanara), simply means "yellow Kanchanara," marking it as the yellow-flowered member of the Bauhinia group.

The Bhavaprakash Nighantu describes it as more common in southern India and used much like other Bauhinia species for glandular swellings. Its classical profile is astringent, light, dry and cooling, and its main recognized constituents are tannins.

The classical record for Soma Vriksha is short and focused. The Bhavaprakash Nighantu lists two therapeutic actions (karma), and everything below grows out of those two, read alongside the herb's taste and qualities.

Resolving Swellings

The first action is resolving swellings (Granthihara). A granthi is a knot or lump, so a granthihara herb is one used to help dissolve glandular swellings and hard lumps. This is why the text groups it with other Bauhinia species used for glandular swellings.

Our knowledge graph links Soma Vriksha to inflammation (Shotha), the Ayurvedic term for swelling and puffiness in the tissues.

Astringent, Binding Action

The second action is astringent or binding (Stambhana). In Ayurveda a stambhana herb holds back and firms up, reducing excess flow and looseness in the body.

This matches its taste. Soma Vriksha is purely astringent (Kashaya rasa), the puckering taste of unripe fruit or strong tea, which classical theory associates with drying and tightening. Its tannin content fits that same astringent character.

Why the Properties Matter

The herb is light (Laghu) and dry (Ruksha) in quality (guna), meaning it is easy to digest and tends to absorb moisture rather than add it. Its potency (virya) is cold (Sheeta), and its post-digestive effect (vipaka) is pungent (Katu).

Light, dry and astringent together describe a herb suited to swollen, heavy, damp conditions rather than dry, depleted ones.

Here the honest answer is short. The classical sources in our data describe what Soma Vriksha does, but they do not specify a preparation form, a dose, a vehicle (anupana), which simply means the liquid or food a herb is taken with, or a time of day.

The Bhavaprakash Nighantu notes that it is used similarly to other Bauhinia species. That is a clue to how practitioners may approach it, but it is not a dose, so please do not treat it as one.

If you want to use Soma Vriksha, work with a qualified Ayurvedic practitioner who can choose the form and amount for your constitution and condition.

Our classical sources do not list specific contraindications, drug interactions or overdose signs for Soma Vriksha. That is a gap in the record, not a guarantee of safety.

What the Properties Suggest

The herb is astringent, light, dry and cooling. In Ayurvedic reasoning, herbs with this profile are matched to swollen, damp states, and a practitioner would weigh carefully whether they suit someone who is already dry or depleted.

Its binding (Stambhana) action is meant to hold back excess flow. That is a reason to have a practitioner decide when it fits, rather than taking it on your own for long periods.

Pregnancy, Nursing and Medications

Classical sources in our data do not address pregnancy, nursing or use alongside prescription drugs. If any of these apply to you, speak with your doctor and a qualified Ayurvedic practitioner before using it.

Any swelling or lump that is new, growing or painful should be checked by a doctor first.

Our classical sources compare Soma Vriksha mainly with its own relatives, the other Bauhinia species. The table sticks to what the record actually says.

Our classical sources give no population-specific guidance for Soma Vriksha. The notes below are cautious by design.

Pregnancy & Nursing

Classical sources in our data do not specify whether Soma Vriksha is safe in pregnancy or while nursing. Avoid it during these times unless a qualified practitioner and your doctor both approve.

Children

No dose for children is given in our sources. Do not give it to a child without guidance from a qualified Ayurvedic practitioner and a pediatrician.

Elderly

The herb is light, dry and astringent. Older adults who tend toward dryness should only use it with a practitioner who can judge whether those qualities suit them.

Athletes

Our sources do not describe any use for performance or recovery. Any interest in it for swelling after exertion is a question for a practitioner, not something the classical record addresses.