It seems some research points to Vitamin C as being quite helpful in improving sperm and helping conception.
Per Dr. Marilyn Glenville, of www.marilynglenville.com,
"Vitamin C is also an antioxidant, and studies show that vitamin C enhances sperm quality, protecting sperm and the DNA within it from damage. Some research has indicated that certain types of DNA damage in the sperm can make it difficult to conceive in the first place, or it can cause an increased risk of miscarriage if conception does take place. If DNA is damaged, there may be a chromosomal problem in the baby, should the pregnancy proceed. Whether or not DNA damage does have these effects has not been conclusively proven, but it's worth taking vitamin C and the other antioxidants as a precautionary measure.
Vitamin C also appears to keep the sperm from clumping together, making them more motile."
