There are other issues too. Not least the lack of scientific studies and human-trial research on these substances, and the fact that the label “superfood” is a marketing invention, not a legal definition. These “miracle” powders are expensive, and if you have existing digestive issues you might not feel any benefits. The nutrition therapist Ian Marber says, “These are concentrated levels of nutrients in a food state, and can be absorbed quite easily. But, on the other hand, we don’t yet know if we can absorb that many nutrients, nor if we actually need them, nor if having these extraordinary amounts has a detrimental effect. The human body can only process so much at once.” He gives short shrift to the movement’s celebrity proponents. “The idea that because so-and-so takes them then somehow we’ll look the same is just silly.”
Grape seed oil may provide some health benefit. A 1993 study supports the claim that grape seed oil increases high-density lipoprotein (HDL-C or "good cholesterol") levels and reduces LDL levels.
Although grape seeds contain antioxidants and other biologically active compounds,the cold-pressed grape seed oil contains negligible amounts due to their insolubility in instance, sufficiently high amounts of resveratrol occur in grape seed for it to be extracted commercially, yet it is almost entirely absent in the grape seed oil.