I had a TCM doctor in Beijing prescribe me raw herbs last year, which was a formula based on buzhong yiqi tang. I was taking about 130g of herbs a day. He then switched me to teapills, which were the equivalent of 14g of herbs a day. When I moved back to the US, I started taking Meridian powder - which was 10g a day of 5:1 concentration, equivalent to 50g of herbs. Then I started using Dragon Herbs Buzhong Yiqi wan capsules, which recommended taking 6 a day. They have .5g of 7:1 herbal concentrate each, so that’s equivalent to 21g.
What’s the logic behind the significant variation in recommended dosage between different forms of the medicine?