@83377 yes they can’t because they have been niacin and tryptophan deficient their whole anthropology – but now they can … you’re believing authors saying this about C that we must supplement it – who don’t even know the difference between niacin and niacinamide, let alone what I just showed you

@83377 SAME HUMANS CANT SYNTHESIZE NAD+(without niacin supplemented) … SO ADMINISTER NAD+ and call it a vitamin too???

@83377 this 10000% happens in humans too … all living things… it’s the electron transport chain.. we just haven’t taken niacin with L-tryptophan enough and properly to manifest it fully yet. There is a reason members are finally all excelling without “vitamin C” and who were suffering in relation just previously if “vitamin C” was included and retained too much/long

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@83377

Humans don’t have this photosynthetic ETC…

…but we do have an almost parallel redox cycle inside mitochondria, cytosol, and peroxisomes using the same cofactors.

In human cells:
• Niacin → NAD⁺ / NADP⁺ → NADH / NADPH
• NADPH is regenerated via:
• Pentose phosphate pathway (G6PD)
• Malic enzyme
• NADP⁺-dependent isocitrate dehydrogenase

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How NADPH regenerates ascorbate in humans

This happens through the ascorbate–glutathione cycle, which is functionally identical to the APX/GSH/DHA system in plants.

⸻

So in humans, NADPH from niacin indirectly keeps ascorbate (vitamin C) reduced and active via the glutathione–ascorbate coupling system.
So yes — the mechanics are analogous:
• NADP⁺ (from niacin) accepts electrons from metabolism.
• NADPH donates electrons to glutathione reductase.
• GSH then reduces dehydroascorbate → ascorbate, restoring vitamin C.

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Simplified summary

In both plants and humans, niacin-derived NADPH is the universal “electron currency” that keeps antioxidants (like ascorbate and glutathione) reduced and active.
Humans don’t use chlorophyll or PSI/PSII for this — we use metabolic dehydrogenases — but the redox logic is identical.the ascorbate–glutathione cycle, which is functionally identical to the APX/GSH/DHA

@83377 We have more than enough ascorbate in diet these days.. we are just not regenerating it / keeping it reduced and active at the rate we need to because of not the lack of ascorbate being consumed (then from diet) daily but because of the lack of supplementing sufficient nicotinic acid supplied with free-form L-tryptophan fraction daily to make adequate NAD+ to accomplish such recycling. This applies to pretty much ALL other so-called nutrients that all sorts of investigators and clinicians, “experts” claim we have to supplement too — who are all missing the underlying causality of what niacin making NAD+ (protons) entails combined with the related responsibilities, in coupling to niacin making NAD+, of tryptophan as the other growth factor.

@83377 Tragically, while “overlooking” the causal influence of niacin-NAD/tryp, oblivious to their underlying subclinical pellagra, folks are eager to take whatever alternatives experts misadvise instead, not realizing the level of damage they’re afflicting to themselves in the process.