Not any, a swab in the mouth and $107.50 at the National Geographic Genographic Project. Do a search using that high-lighted title.
National Geographic Genographic Project https://www3.nationalgeographic.com/genographic/index.html
uses FamilyTreeDNA to do their test. They are identical. So either test is fine.
However, National Geographic is looking more for deep ancestry roots, a sort of where are we from question, while FamilyTreeDNA is more for amateur genealogist tracing their family tree. Also, FTDNA has the surname groups, which as in the case of LAMB, helps you link up with others. There is a minor discount if you use a surname group.
Confused? Watch the videos http://www.familytreedna.com/videoaudio.html