Post Accutane, how long would it be before I can go back on taking mutivitamins and minerals and gym supplements?

I have officially finished my accutane regimen! I took 40mg for almost 8months, my weight is around 70kg. I am a very active person in the gym and outdoors, the only side effect i had was dry skin, nose and dry lips. Physically, I was ok, I was able to finish a spartan beast under the sun. I was a little bit weaker, probably because I stopped all my supplements and multivitamins and minerals. I do want to know how long should I wait before I can take my supplements including multivitamins and minerals.