You may find mixing it up works better. I fast two days a week but not straight after each other, this keeps you metabolism guessing. It also will allow you to keep doing exercise without too much trouble. You shouldn’t need supplements although taking in some fibre such as psyllium husks should keep you regular and something like chlorella is said to bind the toxins together. I don’t like the chlorella flavour but can stomach it if I mix with water, turmeric, Tabasco sauce and some Himalayan salt. Longer fasts you can throw in from time to time but they are more to do with cleansing than weight loss. Otherwise you may find you gain the weight back if you return to eating normally.