I'm not sure how much value I'd put in nutritional deficiency tests unless something severe shows up. There are plenty of opinions out there that believe that your body burns through it's resources when you're stressed, and therefore you're bound to be running low. Your diet should take care of that over time, including any supplements you're already taking.

I usually take my probiotics after lunch, which is really my breakfast....the first meal of the day for me. That's when I take most of my supplements.