It all depends on how bad your candida situation is, and how well your body is able to cope with them. If the situation is bad, there is no substitute for a candida diet, as your body can't simply tolerate much garlic for a longer period.

I simply feel explosive (the heart may want to have a race) if I take too much garlic, and get a bad diarrhoea, and the urine is foamy, with perhaps a feeling of burning under skin.

I'm not sure if garlic is of any use to chelate mercury, but it sure bites on candida for me.