Do these work and what the side effects .

Check out this mega-thread:
https://www.askmehelpdesk.com/skin-lightening/skin-lightening-pills-8267.html?highlight=skin

There is no proof that these so called skin lightening pills will make you lighter, and I'm sure most of them aren't safe. If you have hyperpigmentation problems, please consult a dermatologist.

I can almost guarantee this will work for just about everyone. I use the "spa grade microdermabrasion" from eBay, then fresh squeezed lemon about 1/2 hour later and put it on dark spots. It's been working like a charm. I wouldn't ever take any pills. Natural is always better.