I think that Colonics can be done during Phase 1 for some reason.
To answer this question "Candida Yeast Overgrowth - what can be used on this phase?" - By doing the HCG Diet, this should help get rid of any Candida Yeast Overgrowth.
About the "Acetyl L-Carnitine & Whole Food Supplement" If you feel like it is something that you need to use, and it doesn't contain any of the chemicals that are listed as things to stay away from, then you might give it a try. But if you suddenly plateau or start gaining weight, then you will know why.