SeaSilver does not contain a metalic form of silver - hence there are no heavy metals in it. I have been taking Seasilver for over one year now. It is a nutritional suppliment containing all vitamins, micro and macro minerals, amino acids etc... The taste is great also. I never noticed a change in my energy when I first started taking it, but do notice a decline in energy when I forget to take it for a day or two. If you have questions you can go to their web site at www.seasilver.com they will answer any questions you have and they also post a 1-800 number where the phone is answered right away.