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Source Naturals Zembrin® Description Supports Mental Well-Being Suitable for Vegans and Vegetarians Zembrin is an extract of Sceletium tortuosum, an herb traditionally used by the Sam people of South Africa for over 300 years to support emotional and mental well-being. Take one small tablet per day. Zembrin is the first product with a benefit-sharing agreement disbursing royalties to benefit the San people and ecologically sustainable cultivation in Africa.