Naturally grown,raw VC was collected from local clean
area which uses natural growth without spray of insect-toxin drugs at Chiang Mai Province, Thailand. VC was
washed four times and cut to small piece approximately
one inch and heated until dry by an oven at 70 decree C.
VC was then kept in a sterile bottle which contained a
small bag of anti-moisture silica-gel pills. Each day for
preparation, 20 grams of dry VC material and 3 cups of
clean water (390 milliliter) was boiled in a traditional pot