Isatis tinctoria, or woad, is a plant with a long history of topical use for skin health. Traditional applications target conditions like eczema and psoriasis. Its leaves contain compounds such as indigo and tryptanthrin, which possess anti-inflammatory and antioxidant properties.
Some people take woad internally as a tincture, tea, or encapsulated powder to support the immune system, though strong evidence for this use is missing. For skin application, you will find it sold as a cream or ointment.
Internal dosing lacks any standard, and product quality varies. Insufficient safety data exists for pregnancy and breastfeeding, so avoid internal use unless a qualified practitioner tells you otherwise. Drug interactions are not well documented, but you should always speak with a healthcare provider before mixing it with medications or other supplements.