Male Plus was developed exclusively for men and contains four powerful herbs from the Amazon Rainforest including Muira puama and Catuaba— two Brazilian plants that have been us for a long time in Brazil as male libido enhancers, male tonics, and supportive of male sexual organs and systems. The key ingredient of this dynamic formula is a highly concentrated extract of Muira puama. Recent clinical research has shown an extract of Muira puama to be highly effective in over 64% of 362 men studied in increasing libido.