I took the test twice and failed both times. I followed everything perfectly. 23andme states that "only 3% of first kits fail". It seems that one reason people may fail is because the concentration of DNA is insufficient to produce genotyping results. Does anyone one know why your saliva would not contain enough. Are there any issues that could cause this? I'm very curious. I bought their Health + Ancestry kit, but mainly cared for the Health aspect.