I was reading on a research report from NIH on Fenugreek for prostate cancer 
and in short it mentioned fenugreek and turmeric are better taken as a whole 
rather than isolating their beneficial component,
 
" This suggests that the whole product may have certain advantages over 
purified and isolated constituents of extracts. Some other studies too have 
shown the potent effects of whole extracts as opposed to individual components 
of the extracts [9, 10]. Curcumin - isolated from turmeric – is one example. 
Curcumin did not have the same ability to inhibit basal CYP1A1/1A2 enzymes in 
tissues of mice as did turmeric [11, 12]."
 
This is where i found it:  
Cancer Biol Ther. Author manuscript; available in PMC 2011 May 16.
Published in final edited form as:
Cancer Biol Ther. 2009 February; 8(3): 272–278. 
Published online 2009 February 18. 
PMCID: PMC3095649
NIHMSID: NIHMS283130
 
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Better to just buy by the pound and encapsulate the whole thing yourselves.  We 
use most of our herbs as tea.
Melly