Herbal Tincture Formulas › Einstein Extract Image 1 of 1 Einstein Extract from $14.49 Improves memory, mental clarity, and focus.Ingredients: Ginkgo, Gotu Kola, and Calamus Size: Select Size 1 ounce 2 ounces Quantity: Add To Cart Added! Improves memory, mental clarity, and focus.Ingredients: Ginkgo, Gotu Kola, and Calamus Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More