I would first recommend speaking with a dietitian in your area who can look at your overall current diet and health history to make sure an all liquid diet is appropriate for you. When using a Blast as a meal replacement you'll want to make sure it include the right combination of macronutrients (enough protein, carbs, and healthy fats). You will also want it to have enough calories to fit within your daily needs. A supplement that includes B12, vitamin D, and calcium are helpful for those following a strict vegan diet.
Awesome thank you so much for your response. I do take those vitamins as well. Its all in my multi I made sure of that when I purchased it. I will definitely look for a dietitian. Thank you again. :)