"Natural" Blonde Hair Color

Hi guys!

I have naturally dark blonde, long, fine hair.
I used to dye my hair light blonde for years, which totally thinned them out. That's when I grew out the blonde color and let my hair be all natural. It got healthier and thicker again.
But I miss my "signature hair color"....and was thinking about if there are any alternatives that wouldn't ruin my hair.

I found "natural" blonde hair color, like herbatint and naturtint and tints of nature. They claim they won't damage your hair. Check it out: http://www.amazon.com/gp/product/B000OO63ZS/ref=s9_simh_gw_p194_d2_i2?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-2&pf_rd_r=187NQX545PE86HGEAD4P&pf_rd_t=101&pf_rd_p=1389517282&pf_rd_i=507846

I am not sure what to do...
Is there such a thing as "damage free light blonde coloring"? Should I rather stick to my natural hair color instead of risking it?

Have you tried such a natural hair coloring product before (light blonde)? Any reviews or tips?

Also, I was wondering what shampoo/conditioner/hair care products you would suggest for keeping colored blonde hair healthy and thick?

Cannot wait to hear your input!

- Carry