Kahlon, TS., Chapman, MH., Smith, GE
However, the intranasal route of drug delivery still has some unresolved issues, such as the need to overcome cilia and mucosal clearance in the vestibular region, as well as enzymatic degradation after the introduction of nanotherapeutic formulations into the nasal cavity[166]
[DOI] [PMC free article] [PubMed] [Google Scholar] 20.Slavich G.M., Shields G.S., Deal B.D., Gregory A., Toussaint L.L
Diseases like celiac, Crohns, or other gut illnesses may make it harder for your body to absorb the vitamin
Free Radic Biol Med , 2001
Large-scale, long-term clinical trials are still lacking to decisively prove anti-aging benefits or prevention of cognitive decline