First of all I’d like to thank everyone for their help and suggestions. However I’m still a bit confused on which is the recommended daily dosage. People posting here have given different dosages.
Able900 suggests 420-560mg/day spread over 16hours
raster suggest 400-800/day (1-2 400mg capsules/day)
Wiley200 suggests 300-900mg/day (1-3 300mg capsules/day)
I guess it is not so important and one can take around 500mg/day.