I had my hair analysis done a few years back - just for interest. There was nothing alarming in it and I wasn't sick.

These tests are not the be-all and end-all of tests but it can show up exposure to toxicity and is helpful when people are not getting anywhere with normal testing.

Blood tests usually show up a snapshot of right now and if you have been exposed to something a while back, your blood has been cleaned and the toxicity removed or stored in your bones and fat tissue.

I think the most reliable is a tissue style test where some body tissue like fat is taken and analysed but I don't know anyone who has had it done. I have read in books where it has been done to look at the toxicity of people in general.

The book I like best which deals with toxicity is 'Detoxify or Die' which is written by Dr Sherry Rogers and is written in simple english. I think everyone should read it - not to alarm people but to educate people so over time they can make informed decisions for themselves.