Vegetology Our B12 sustained release tablet does offer a super strength, so it really depends if you are deficient in Vitamin B12 (and to what extent). There is a good level in VegVit already, so ordinarily I would say that is fine. Depending on your diet, it might be worth getting a B12 test done to see if you do need to take a higher level. From a safety perspective, there is no problem combining the two.