The problem is compounded because there may be a loss of absorption efficiency as we age. (verywellhealth.com)
See my post on increasing iron in your baby's diet for more on vitamin C, which is a great strategy — can double absorption efficiency! (scienceofmom.com)
Sandia's new fractal - like receiver designs have increased solar absorption efficiency without the need for special coatings. (sciencedaily.com)