Matty,
The recommended dosage of zinc is from 15 mg to 50 mg per day. Some guys take 100 mg and are ok. Some people will begin to have a weak immune system past 100 mg. Also for best results take copper with the zinc at a 10-1 ratio (copper being the 1) also copper generally should not exceed 10 mg per day. Many people get nausia when taking 10 mg or more of copper and the toxicity gets worse as the dosage increases.
Tribulus Terrestris is an herb that increases Lutenizing Hormone (LH) which results in higher testosterone production. Higher test production is another way to increase sperm production. Clomid also works similarly, and can be somewhat more powerful than Tribulus, but side effects are possible with clomid. Recommended dosage with Tribulus ranges from 5-10 grams per day for men wanting to raise natural test production.
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