I would start at something like 30 billion first, and then move up to 50-60 billion, and then higher to 80 billion. I would start this and the grape bitters 2 weeks into the diet. You may also want to do a prebiotic before a probiotic to help prepare your body better for the probiotic. HMF forte is a prebiotic that contains HMF; human micro flora which will bind to your intestine walls better than bovine derived probiotics. HMF neuro is a probiotic that is stronger and contains 12.5 billion probiotic. These are ones I would consider first and then try the bovine derive probiotics afterwards. Start out at one a day and move up to 2-3 a day for all probiotics.
Grapefruit seed extract is a antifungal used to kill candida. It will only be effective for a few weeks before the candida adapts to it; thats why its best to rotate antifungals if possible.
Grape bitters help normalize the digestive enzymes in your body so that you get more energy from your food. It will also help repair your intestinal walls.