Fitness Articles

Looking for someone to write some very educational fitness product articles for our new supplement store.
Must state the following
Different type
What it does
How its used, and when used
Suggested daily dose
Must be factual written 100% by yourself and not copied of anyone elses work.
The first product article we would like written about is Whey protein, different types, concentrate and also mass gainer proteins.
Must have excellent english writing skills.