The answer to this Q varies for each of us and depends on a few things...
1) What foods are you using in your NutriBlast and what foods do you eat outside of Blasting? Then, do these foods contain all the nutrients that are recommended for you daily?
2) How well does your body absorb and utilize these nutrients (for example, as we age, we lose the ability to absorb vitamin B12 so a supplement is sometimes warranted).
3) What are the levels currently in your body? - This requires testing.
So as you can see, I cannot provide an exact answer. If you're willing to do some detective work, I'd start with keeping a food log and then having it analyzed by a dietitian to see if you're lacking anything in your diet. Then I'd have some blood work done to assess the levels of any nutrient that might be lacking in your diet. Or if you're having any symptoms, then you may want to test for what might be lacking to cause that symptom. After that, you can see what supplements are specific to your needs. This might mean that you can get rid of the multi vitamin (since you're getting a lot of nutrients in your Blast) and focus on some of the other ones that might be lacking or in minimal amounts in your diet.
If these vitamins and minerals were prescribed by a Dr. then by all means continue with them. If you are taking them voluntarily, you may wish to consume foods high in those nutrients instead of taking the supplement.
Here are some food options:
Vitamin E - sunflower seeds, almonds, spinach, olive oil, asparagus, Swiss chard, kale
Omega-3s - walnuts, chia seeds, hemp seeds, flax seeds, avocado
Magnesium - pumpkin seeds, Swiss chard, sesame seeds, spinach, Blackstrap molasses, quinoa, cashews, and oats
Hope that helps!