I have never found any so i have always fed a veriaty of differant foods. i go to the grocery store and by human grade fish, squid, clams, shrimp, and such. I defrost it in a garlic and water. Drain the water off, cut it up in smaller pieces and feed. My guys love it. They have grown and are very healthy now for 2 yrs. Only time i every saw anything out of sorts with them was once my bamboo's eyes seemed cloudy but it cleared up in a day or to. Other then that they have always been very active and healthy. If you do find vitamins for sharks though let me know. I would love to try it.