If your talking d aspartic acid then it will have little effect on anything. It helps normalise natural test levels but doesn't raise it to any kind of steroid type level. If you have just come off cycle then it can help in getting your test back to normal natural range and this will help with any lethargy and libido issues. Studies show that it loses its effects after 12 weeks and can even start lowering levels again so I wouldn't run it year round.
If your talking about something else then apologies.