Can taking Viviscal affect my ability to impregnate my wife in the future?

I'd give the company a call if you have concerns. That's the best way and most direct way around it.  Viviscal is derived from seafood proteins. There should be no concerns about male fertility based on it's mechanism of action.  But over the counter supplements don't have the same degree of testing that other FDA approved treatments have. To my knowledge there have not been large studies looking at your exact question. If you have concerns about hair loss, speak to a hair loss expert to get advice about the most effective treatments.

Viviscal is a nutritional supplement based on a marine complex. The manufacturer's advice is that it should not be taken during pregnancy but this is because it's safety in pregnancy has not been the subject of a study. There is no problem with you taking it whilst trying to father a child. The only contraindication that I am aware of to taking Viviscal is an allergy to fish or shellfish. The product certainly has a lot of celebrity endorsement!

I think if you are taking something for your hair loss and want to know the safety of it, look at the package insert as the FDA requires all inserts to cover warnings. I don't have the package insert so I can't tell you the answer to your question.  Your biggest enemy is the
progressive thinning leading to a balding pattern that is not evident at this
point in time. The degree of thinning that you are showing would suggest that
you should see a doctor who most likely will get Bulk Measurements of your hair
to determine the degree of the thinning that you are presently having. If the
diagnosis is early genetic hair loss, then the best treatment would be the drug
finasteride which is highly effective in men of your age and may not only stop
the hair loss but possibly reverse it. If you are developing a more advanced
balding pattern the best test to get will determine the Bulk Measurements of
your hair and this will show, over a one year time frame, how effective the
treatment will be. Once you know this information, then you and your doctor
need to develop a MASTER PLAN which will define what you need to do over the
years to come.