Natural Factors Stress-Relax Kava Kava - 250 mg - An herb that has been used traditionally in Polynesian cultures for centuries. Kava Kava helps calm occasional anxiety, stress, and restlessness, and supports healthy sleep. Kavapure is standardized to 30% kavalactones, the active constituents in Kava Kava. Expert sourcing and extraction methods utilized by Kavapure maximizes the quality and consistency of the active ingredients, ensuring the highest possible bioavailability.