Giloy (Tinospora cordifolia): Benefits, Evidence and a Liver-Safety Caution
- , by SANUSq Research team
- 9 min reading time
Known in Ayurveda as the "heavenly elixir", giloy has been used for centuries as an immune tonic — but modern experience has added an important note of caution that any honest account has to include. Here we set out the giloy (Tinospora cordifolia) benefits the research genuinely supports, what remains traditional rather than proven, and why the liver-safety question matters more than any of it.
What is giloy?
Giloy (Tinospora cordifolia), also called Guduchi or Amrita, is a climbing shrub native to the Indian subcontinent and long central to Ayurvedic medicine. Its Sanskrit names translate as "heavenly elixir" and "the imperishable", reflecting a traditional reputation as a rasayana — a rejuvenating tonic thought to promote longevity, vitality and resistance to illness. Traditionally, the stem is used for a wide range of complaints, from fever and infections to inflammation, and it's best known today as an immune-supporting herb.
The plant is a deciduous climbing vine with heart-shaped leaves, and it's mainly the stem that's used medicinally. Its activity is attributed to a rich mix of plant compounds — alkaloids (such as berberine), diterpenoid lactones, glycosides, steroids and polysaccharides — several of which show immune-active and antioxidant effects in the laboratory. That complexity is part of what has made giloy such a staple of traditional formulations, and part of why its full pharmacology is still being unravelled.
You'll see giloy sold as capsules, tablets, powders, juices and traditional decoctions, and it often appears in multi-herb Ayurvedic formulas rather than on its own — which can make it hard to know exactly how much you're taking.
Giloy for immunity: what an immunomodulator actually does
Giloy is classed as an immunomodulator — a substance that helps regulate immune activity rather than simply switching it up or down. Laboratory work has identified compounds in the plant (including polysaccharides and alkaloids) that appear to activate immune cells such as macrophages, which is the basis for its traditional use in fighting off infections and supporting recovery. Much of this is preclinical, but there is some human research, most notably in allergy: giloy is among the natural remedies for hay fever that have actually been tested in a randomised, placebo-controlled trial.
In a randomised, double-blind, placebo-controlled trial in 75 patients with allergic rhinitis (hay fever), eight weeks of Tinospora cordifolia extract produced marked relief from sneezing, nasal discharge, obstruction and itching compared with placebo (Badar et al., 2005).
A useful nuance: "immunomodulator" is not the same as "immune booster". Rather than simply revving the immune system up, giloy is traditionally thought to help balance it — which sounds gentle, but as the liver findings below show, stimulating immune activity is not automatically harmless. Interest in giloy soared during the COVID-19 pandemic, when it was widely promoted across India as a natural immune booster; that surge in use is precisely what brought its risks into focus. It is worth holding on to that whenever giloy appears on lists of natural immunity boosters: the label flatters the herb and understates the care it needs.
What it's traditionally used for
Beyond immunity and allergy, giloy is traditionally taken for a broad sweep of purposes: to help the body handle fevers and seasonal infections, to calm inflammation, to support blood-sugar balance, and as a general adaptogenic tonic for stress and stamina. Small studies have explored several of these, but for most the evidence remains early and limited — interesting signals rather than firm proof. Giloy is genuinely a fascinating herb with a long track record of traditional use; it just hasn't yet been tested in the large, rigorous trials that would let anyone make strong health claims.
Other areas being studied
Researchers have looked at giloy well beyond allergy. Small studies and traditional use point to possible roles in supporting healthy blood-sugar levels (it has a long Ayurvedic history in diabetes), in calming inflammation and fever, and as a general antioxidant and adaptogenic tonic for stress and stamina. There's also laboratory interest in its compounds for liver protection and even anticancer activity — though, tellingly, the same immune-stimulating and liver-active properties that make it interesting are also tied to the safety concern that follows. Across these areas the pattern is consistent: promising traditional use and early signals, but a shortage of the large, well-controlled human trials needed to turn "traditionally used for" into "shown to work for". For now, giloy is best understood as a time-honoured herb with genuine research interest and genuine open questions.
An important safety caution
Here's the note that any responsible article on giloy must include. During the COVID-19 pandemic, when giloy was heavily promoted as an immune booster and use surged, doctors in India began reporting cases of serious liver injury linked to its use.
A multicentre study across 13 Indian hospitals documented 43 cases of herb-induced liver injury temporally associated with giloy use, presenting as acute hepatitis with autoimmune-like features; the authors concluded giloy can trigger this injury and unmask underlying autoimmune liver disease, and urged caution with the herb (Kulkarni et al., 2022).
This doesn't mean giloy is dangerous for everyone, and the very immune-stimulating action it's prized for may be part of why it can, in some people, provoke an autoimmune-type reaction in the liver. But it does mean giloy should be treated with real respect: it is not suitable for anyone with a liver condition or autoimmune disease, or during pregnancy or breastfeeding, and anyone taking it should stop and seek medical advice at any sign of liver trouble — fatigue, nausea, loss of appetite, abdominal pain, dark urine, pale stools or yellowing of the skin or eyes. As always, talk to your healthcare professional before starting any new herbal supplement, and be especially careful with giloy.
None of this is to dismiss a herb with real traditional standing and some encouraging research. The point is balance: giloy is not a casual, take-it-just-in-case supplement. If you and your doctor decide it's appropriate, it makes sense to use a reputable product for a defined period, avoid stacking it with other liver-stressing supplements or alcohol, and have liver function checked if you use it for any length of time.
Frequently asked questions
What are the main giloy benefits?
Traditionally it's used as an immune tonic and for fevers, infections, inflammation, blood-sugar balance and general vitality. The strongest human evidence is a small trial showing benefit in allergic rhinitis; most other uses rest on preclinical or limited data, so they're best viewed as traditional and promising rather than proven.
Does giloy really help immunity and allergies?
Giloy is an immunomodulator, and a randomised trial found it eased hay-fever symptoms, which is encouraging. But large, high-quality trials are lacking, so it's fair to call the immune and allergy evidence preliminary rather than conclusive.
Is giloy safe for the liver?
This is the key caution. Multiple documented cases — including a 43-patient multicentre study — have linked giloy to acute liver injury with autoimmune-like features. It should be avoided by anyone with liver disease or an autoimmune condition, and stopped immediately if any signs of liver trouble appear. Always consult a doctor before use.
Who should not take giloy?
Anyone with a liver condition or autoimmune disease, people who are pregnant or breastfeeding, and children. Because of the documented liver-injury reports, giloy is a herb to approach cautiously and only under professional guidance.
How is giloy taken, and for how long?
Traditionally it's taken as a stem decoction (kwath, or giloy kadha), powder, juice or extract, often over several weeks for immune or allergy support; the giloy kadha benefits claimed in traditional use are the same immune, fever and inflammation uses described above, not a separate set. Given the liver-safety concerns, though, it isn't a herb to take open-endedly or unsupervised — use it only for a defined period and under professional guidance.
References
- Badar VA, Thawani VR, Wakode PT, et al. Efficacy of Tinospora cordifolia in allergic rhinitis. Journal of Ethnopharmacology. 2005;96(3):445–449. PMID 15619563
- Kulkarni AV, Hanchanale P, Prakash V, et al. Tinospora cordifolia (Giloy)-induced liver injury during the COVID-19 pandemic—multicenter nationwide study from India. Hepatology Communications. 2022;6(6):1289–1300. PMID 35037744
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