It is disgusting how people with no knowledge or lacking information like you can post stupid opinions and lie to other people!
First: Transdermal magnesium therapy works, like other transdermal treatments. Ever heared about iontophoresis?
Second: Absorbtion of chelates are good, but only if your gut system is perfect, your Vitamin supply is sufficient, you take no drugs and drink no sodas. Otherwise the possible absorbtion will be blocked.