A little goes a long way, and Ive even noticed a slight improvement in my skin tone
High proline content, acid-stable
This inhibition preserves cellular NAD+ levels by reducing their consumption, simultaneously increasing GLUT4 transporter expression and activating sirtuin 1, known as the "longevity gene." The compound exhibits high membrane permeability and selectivity without affecting related methyltransferases or NAD+ salvage pathway enzymes, creating targeted metabolic effects while maintaining cellular safety
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The Science of the Total Environment, 640641 , 13121319
Nevertheless, the most likely conclusion up to date would be that it was indeed taken up as sorbitol was added to the medium and might easily been taken up as it is water-soluble