 Andy Lewis of The Quackometer has described Avemar as a questionable, unproven treatment, "not unlike a marmite pill".According to the Memorial Sloan-Kettering Cancer Center, FWGE should not be taken by children or by women who are pregnant or breastfeeding.It should not be taken by those who have undertaken organ or tissue transplants, or those who suffer from bleeding erosions or bleeding ulcers of the gastrointestinal tract, enteritis, colitis, or malabsorption syndrome.