Identity and form
St. John's wort is Hypericum perforatum aerial material or extract, often standardized to hypericin or hyperforin.
The label should identify the source, form, preparation, and active or marker amount when those details determine comparability.
What the evidence can answer
Human research has examined St. John's Wort in relation to mood and stress-response measures. The amount, source, preparation, population, comparator, and measured outcome determine whether a result applies to a finished product.
Current WQ evidence label: Limited human evidence. This label describes the present evidence context, not a promise of benefit.
Safety and decision context
High-caution knowledge. This substance has drug-like pharmacology or a drug/supplement boundary that requires specialist review. Serotonergic medicines and combinations require professional review. Pregnancy and breastfeeding safety is uncertain or specifically cautioned.
Review medicines, pregnancy or breastfeeding, allergies, medical history, and the complete finished label with a qualified professional when relevant.
How WQ connects this entry
WQ links this canonical identity to exact aliases, research topics, related ingredient forms, products with matching structured data, and articles that name the same entity. Related does not mean equivalent or recommended.
