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Amino acids and zinc if taken have proved to increse the ejaculation volume.Amino acid and zinc if taken together not only increses the sperm volume but also increases the mobility and also the sperm count
Peanuts,almonds,choclates,raisins, are protein rich foods.
Frequency also effects the volume.If you abstain from sex for 2-3 days next time you will have a increased ejaculation.
For prescription of pills you should refer to a gynaecologist.