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Pure D-Aspartic Acid Powder300 g Per Container3 g Per Servings100 ServingsDietary SupplementTested for Purity & PotencyPrimaForce® DAA is a great supplement for men who want to increase their libido. D-Aspartic Acid works by boosting natural testosterone levels and is commonly taken by men after they turn 30 when their natural supply of testosterone begins to fall. Another reason men take DAA is because it aids male fertility by improving sperm count and motility.At various doses DAA supplements have been reported to also help increase energy levels and build muscle.