Goldenseal (Hydrastis canadensis): traditional uses, phytochemical profile, preparation methods, and contraindications for this berberine-rich rhizome.

Astragalus (Astragalus membranaceus): adaptogenic tonic from Traditional Chinese Medicine, immune uses, decoction preparation, and contraindications.

Horsetail (Equisetum arvense): diuretic and remineralizing properties, tea preparation, and contraindications for pregnancy and kidney disease.

Oregano (Origanum vulgare): aromatic Lamiaceae herb; see traditional uses, tea and oil preparation, synergies, and contraindications.

Spirulina (Arthrospira platensis): protein-rich superfood packed with antioxidants; see preparation, traditional uses, contraindications, and side effects.