The products are fine (provided you are not allergic to shell fish). They contain what they say and the medium that they are suspended in is fairly digestible (some cheaper vitamins and supplements have all the stuff they claim but a poor, indigestible medium so most of the ingredients leave the body unused).
The biggest factor is always you. Most of the failures that I have seen are do to the person, not the product.
Dont start until you are well motivated.
Dont start until you are willing to think about changes beyond the short term.
Have reasonable expectations of the product and yourself. you could have the best nutrtion, best facility and all the steroids on the planet and they will serve you no good until you are ready to work at it.
Success at this takes the rest of your life. Fortunately, that's exactly how long you have.
Wishing you the very best success!