50 mg is a big dose to start. Many like to start as low as 6 mg or so, or 12 mg etc. In Cutler's book you can take up to 200 mg, but I would not go NEAR this dose until you have been chelating for quite sometime and gradually built your tolerance up to higher doses. 50 mg is fine, but it maybe too much to start off with. If you feel the effects from this become too much, I would probably stop the round, wait a few days and then start again on a lower dose. Though it's not advisable to stop the round halfway through, sometimes if a dose is causing far too many effects, sometimes one may not have much choice if the discomfort becomes intolerable. It is not ideal to increase or lessen a dose during a round. Again this alters the consistency of chelating levels in the blood stream too. You want to avoid altering the levels of the chelator in the blood as much as possible by sticking to the same dose throughout the round and keeping to the frequent dosing times. This is very important, actually more important than how much of the ALA you are taking.

As you have already started on 50 mg, see how you go on that dose and see if you can continue taking that for 3 days straight. Again if it gets too much, stop and break for a few days before trying again on a lower dose.

I do not believe it is causing candida die off. I don't believe that ALA is an antifungal as pgm on here believes. I suffer with bacteria/virus/candida problems and taking ALA actually flared this up if anything, but created no sense of healing or healing symptoms and really didn't do much if anything for me at all and I stopped taking it. I realised then that my problems now probably no longer have mercury involved. Chelation doesn't tend to do a thing for me these days. So certainly no positive effects in that area were noted. however, when I had mercury poisoning, I tried it once and got healing symptoms! I got healing symptoms from DMSA, or anything that chelated mercury. Keeping to Cutler's protocol enabled me to keep those symptoms somewhat tolerable, though I still felt the detox (which is expected).

So in my personal view, I would imagine that it is highly possible (probable) that you are already experiencing the ALA removing metals from the problem areas of your body. Some people feel worse on ALA as its removing metals, some feel better. Either way it's a good sign. Feeling nothing at all, even on a high dose for an extended period probably indicates mercury may not be the problem. It's very individual and sometimes you will feel different on different rounds. You can have good rounds or difficult rounds. Either way, it usually indicates it's doing the job! Some people find their yeast/pathogen issues act up worse during chelation with ALA or DMSA (I find it worse with ALA), and that can be a problem, but it's not "too" bad. It's much worse to go and eat a load of sugar or something and chelation is what CURES the underlying metal poisoning, which maybe creating the pathogen problem in the first place, so Andy usually indicates that one should use it even if they are suffering yeast problems, but to just try and treat the yeast the best they can in the meantime.

Mercury gets into the muscles and into gums, into the jaw, almost anywhere. So it's not surprising if you feel like something is happening in those areas. Some people even feel a pulling sensation during chelation. You may experience mental effects on ALA, like euphoria, or depression, or increase in anxiety etc. It does not tend to suppress side effects like DMSA can. So don't be alarmed if you experience any strange mental symptoms! You may even feel really good! It's not always predictable.

The main test is what happens over time as you continue chelating. If it's chelating out metals, you should start to notice improvements last a bit longer as time goes on and eventually should lead to permanent improvements. But it takes time to get to that point.
Some people reach a point where the ALA starts to keep them well because it's grabbing mercury before it gets a chance to build up again. So when they quit too early....well you can see what can happen - the remaining mercury that is still slowly leaking out can build up again and make the person feel repoisoned. This is why you need to chelate for about 6 months or more AFTER you "feel" well to make sure it's got most of the metals out and that way when you stop the ALA, you do not regress again.