Sperm; Semen

In the Western and Unani Tradition a great deal of importance was place on medicines to Nourish and Increase Sperm. These were viewed a male tonics and may be given to a male while the female is having medicines for Infertility in order to increase likelihood of conception. Medicines that increase Sperm often also increase Essence, and Essence tonics are important for other purposes such as increasing Longevity and enabling deeper meditation.
In TCM medicines that increase Sperm are Yin Tonics, and likewise a lot of importance is placed on nourishing Yin (Sperm) to enable Yang (Sex drive). Ayurvedic medicines of the Rasayana class tend to nourish Sperm too
In Ayurveda, medicines that affect Sperm are divided into those that Increase Sperm, and those that correct faults of Sperm or improve Sperm quality:
1. Cukrajanana – increase Semen
Pueraria tuberosa, Fritillaria roylei, Lilium polyphyllum, Lipasis restrata, Microstylis wallichii, Phaseolus trilobus, Glycine debilis, Indian Spikenard, Rhus succedanum
2. Cukracodhana – cure faults of the Semen
Aplotaxis auriculata, Myrica sapida, Nauclea cadamba gum, Sugar, Rubelia longifolia, Sesbania granduflora flowers, Andropogon muricatum
In Unani Medicine, the following have been used traditionally for Sperm abnormalities and have been shown in research to have beneficial effects on Sperm:
Chlorophytum borivilianum, Saffron, Nigella, Sesamum seed, Tribulus seed, Mucuna and Withania

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Simples for Defects of Sperm:

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Sperma Multiplicant – Increase Sperm
Confection of Fox testicles
Powder of Three Peppers (Diatrionpiperion) (Galen)
Sweet Powder of Musk (Diamoschu Dulce) (Mesue)
Ambergris Powder (Diambra) (Mesue)
Aromatic Rose Compound (Aromaticum Rosatum) 
Powder of Rosemary Compound (Dianthos) (Nicholas)
Electuary of Orchid (Diastyrion) (Nicholas)
Electuary of Fruit Kernels (Rhazes)
Confection to Increase Seed 
Antidote for Cold Lumbar, Venery, & Defect of Semen
Musali Churna (Curculigo Powder)

Defects of Sperm
Electuary of Orchid (Diastyrion) (Nicholas)
Antidote for Cold Lumbar, Venery, & Defect of Semen
Musali Churna (Curculigo Powder)

Chinese Classification
Simples to Increase Sperm

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Nourish Yin
Liu Wei Di Huang Wan
Zuo Gui Yin
Zuo Gui Wan
Nourish Yin, Warm Yang
You Gui Wan
Jin Gui Shen Qi Wan

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Medicines that Reduce Sperm
Medicines that reduce sperm were applied to Spermatorrhea and Nocturnal Emission. They can help lessen desire, and so were used by Monks to avoid desire. Most notably Agnus Castus was used for this purpose from where its common name Chaste Tree comes.