Solid mechanism; excess intake is a well-established driver of hypertension, while true deficiency (hyponatremia) causes its own real harm.
How it works
Exchange — the primary extracellular cation; drives secondary active transport of glucose and amino acids across cell membranes and sets the gradient nerves depend on to fire
Sense — sodium concentration is directly sensed by osmoreceptors and taste receptors, driving thirst and appetite signaling
Regulate — sodium balance, governed by the renin-angiotensin-aldosterone system, sets blood pressure and ties into the body's physiological stress response
Maintain — sodium bicarbonate specifically also serves as part of the body's extracellular buffering system, helping maintain blood pH within its tightly regulated normal range during and after intense exercise
Exchange — sodium-glucose cotransporters (SGLT1) in the gut use the sodium gradient to pull glucose into intestinal cells against its own concentration gradient, the exact mechanism oral rehydration solutions exploit by pairing sodium with glucose for fluid replacement
Form matters
The same nutrient can be made in very different forms — and a study done on one form does not automatically apply to another. Methylcobalamin is not cyanocobalamin; magnesium glycinate is not magnesium oxide; a whole-food extract is not the synthetic isolate that was studied. Two things decide whether what is in the bottle behaves like the research: the exact form, and independent lab verification (a Certificate of Analysis) that the form and dose on the label are truly what is inside. Without a COA, you are trusting a label, not the science.
The science on Sodium
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Related reading
Articles that go deeper on Sodium.