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Limited evidenceImmunity

Guduchi (Tinospora)

Guduchi (giloy) is an Ayurvedic "immune booster" whose human evidence is thin and whose main claim to fame in the modern literature is a wave of drug-induced autoimmune-like hepatitis cases reported during the COVID-19 pandemic. The safety signal is better documented than any benefit.

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What the science says

  • Prevents or shortens respiratory infections Limited evidence

    Guduchi was pushed hard by India's AYUSH ministry during COVID-19, but the living systematic reviews pooling those trials found mostly small, open-label, single-country studies with high risk of bias and very low certainty of evidence. There is no adequately powered, placebo-controlled trial showing fewer or shorter infections in humans.

  • Protects the liver Limited evidence

    This is the traditional claim, and it is exactly where the modern record turned. From 2020 onward, case series across India, Italy and Belgium documented histologically confirmed drug-induced autoimmune-like hepatitis after self-medication with giloy products, with some patients requiring steroids and a minority progressing to liver failure. Defenders argue the products were adulterated with Tinospora crispa (a known hepatotoxin) rather than authentic T. cordifolia, which is plausible but unresolved and does not help a consumer buying an unverified capsule.

  • Lowers blood sugar Limited evidence

    Animal and small open-label work suggests modest glucose-lowering, but there is no rigorous placebo-controlled RCT with HbA1c as a primary endpoint. Any effect is unquantified in humans.

Dosage & safety

Studied doseTraditional preparations use 1-3 g/day of stem powder or 300-1000 mg/day of aqueous extract, typically in divided doses. There is no dose that has been validated for efficacy in a controlled human trial, and no established safe upper duration.
SafetyThe dominant safety issue is hepatotoxicity: multiple published cases of drug-induced autoimmune-like hepatitis (jaundice, markedly raised transaminases, positive ANA/ASMA, interface hepatitis on biopsy) after weeks to months of use, some needing immunosuppression. Species substitution in the market (T. sinensis, T. crispa sold as "giloy") makes any given product unpredictable. Being immunostimulatory in theory, it is a poor idea alongside immunosuppressants or in autoimmune disease. Avoid in pregnancy and in anyone with pre-existing liver disease; stop immediately and get liver enzymes checked if fatigue, dark urine or jaundice appear.

How to take it

TimingTiming does not matter.
With food?With food.
Worth knowingGiven the autoimmune-like hepatitis case reports, get liver enzymes checked before starting and again at six to eight weeks, and stop at the first sign of fatigue, dark urine or yellowing.

Interactions

With medications

  • immunosuppressants (ciclosporin, tacrolimus, azathioprine, biologics)

    Guduchi is immunostimulatory in theory and may work against the drug you are relying on. do not combine

  • hepatotoxic medication (methotrexate, isoniazid, high-dose acetaminophen)

    Additive liver injury risk on top of guduchi's own documented hepatitis cases. avoid, or use only with liver enzyme monitoring arranged by your doctor

With other supplements

  • other liver-risk botanicals (high-dose green tea extract, kava, ashwagandha)

    Additive risk of drug-induced liver injury. do not stack them

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Is giloy (guduchi) safe for the liver?

Guduchi (giloy) has a documented liver safety signal: from 2020 onward, case series in India, Italy and Belgium reported autoimmune-like hepatitis after self-medication with giloy products, some progressing to liver failure. Adulteration with a hepatotoxic related species may explain some cases, but any given product is unpredictable.

Does giloy boost immunity or prevent infections?

There is no adequately powered, placebo-controlled trial showing that guduchi (giloy) reduces or shortens infections (limited evidence). The COVID-era trials were mostly small, open-label and at high risk of bias, with very low certainty of evidence.

Does guduchi lower blood sugar?

Guduchi's glucose-lowering effect is suggested by animal and small open-label studies, but there is no rigorous placebo-controlled trial with HbA1c as the main outcome (limited evidence). Any effect in humans is unquantified.

Who should not take guduchi?

Avoid guduchi with immunosuppressants, autoimmune disease, pre-existing liver disease, liver-stressing medications or pregnancy. If you use it, get liver enzymes checked before starting and again at six to eight weeks, and stop at the first sign of fatigue, dark urine or yellowing.

Scientific references

Where to buy

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