Dr. Holub - I can't find any human information on the conversion potential of LA (omega-6) to AA (omega-6)?
The pioneering work of Dr. Ed Emken found only a 0.5 % conversion of LA(linoleic acid) to AA (arachidonic acid) when feeding deuterated LA to hgumans (Biochim. Biopphys. Acta, 1213: 277-288 (1994).