This is the most important safety item in the formula. Ginkgo Biloba may affect platelet function, which means it can theoretically increase bleeding risk when combined with anticoagulant or antiplatelet medication.
That covers warfarin, clopidogrel, apixaban, rivaroxaban and regular aspirin. It also matters before surgery — many surgical teams ask patients to stop supplements two weeks beforehand, and Ginkgo is a common reason.
The practical rule: if you take anything that affects clotting, this needs your doctor's explicit clearance, not a website's reassurance.
Ashwagandha may influence thyroid hormone measures, so anyone on levothyroxine or being monitored for a thyroid condition should raise it with their prescriber.
It is also generally advised against in autoimmune conditions without specialist input, on the reasoning that immune-modulating effects are poorly characterised in that population.
Concentrated green tea extract has been associated with rare cases of liver injury, generally at high doses and often in supplement stacks rather than from drinking tea.
The practical implication is not alarm but arithmetic: do not stack multiple green-tea-containing products, and stay at label servings.
Most people who experience a supplement side effect stop taking it and tell nobody, which is why adverse-event data in this industry is so thin.
If you experience something more than trivially unpleasant, three steps are worth taking. Tell your doctor or pharmacist, so it goes into your medical record alongside your prescriptions. Contact the brand's customer support, which is how manufacturers become aware of patterns. And in the US, serious adverse events can be reported to the FDA's MedWatch programme, which is the mechanism by which regulators identify problem products.
That last route matters more in this category than most, because the FDA's ability to act on a supplement generally depends on evidence of harm accumulating after sale rather than on pre-market review.
Also worth keeping: the bottle and its lot number. If a problem is later associated with a specific batch, that number is what connects your experience to it.
None of this is a reason to expect a problem. It is what to do if you have one.
Generally well tolerated at label servings, with three genuine cautions: Ginkgo with blood thinners, ashwagandha with thyroid or autoimmune conditions, and green tea extract with existing liver disease.
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