NAC is necessary to maintain healthy glutathione levels, so oral supplementation makes sense
If this proves correct, blood-brain barrier penetrance may be the wrong language for a real but poorly understood phenomenon, and compound design should target whatever route actually delivers these peptides to the relevant neurons
[1] Without intrinsic factor, dietary B12 cannot be absorbed effectively, leading to deficiency regardless of dietary intake
Referenced Citations Sikiric P, et al
The main tests for checking B12 levels include: Serum Vitamin B12 Test: Measures how much B12 is in your blood, but high levels dont always mean theres a problem
For example, dietary supplementation of polyphenol-rich extracts in animal models, such as grape seed extract in broiler chickens and pigs, has been shown to increase the concentration of antioxidant markers like vitamin E in plasma and tissues, suggesting not only the bioavailability but also the effective physiological action of polyphenols after digestion (363)