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Vitamin C is essential for collagen cross-linking

Mild functional iron deficiency

Under normal physiological conditions, neuronal action potentials are transmitted to presynaptic terminals, causing voltage-gated Ca 2+ channels to open and extracellular Ca 2+ to flow in, prompting synaptic vesicles to release glutamate into the synaptic cleft, where glutamate binds to glutamate receptors on the postsynaptic membrane, triggering the influx of cations into the postsynaptic neuron and altering the membrane potential to achieve signal transmission

It remains a research chemical, and its use in humans is primarily limited to clinical studies, though it is not universally banned