Sea Salt.

Sodium and potassium set the gradient the Na/K-ATPase maintains across every cell membrane, and higher potassium intake increases urinary sodium loss. The two are read as a ratio rather than separately.

Sodium and calcium are handled by linked transport in the kidney tubule, so a higher sodium load raises urinary calcium excretion.

A high sodium load increases urinary magnesium loss, and both are replaced together after heavy sweat losses.

Creatine enters muscle through a sodium-coupled transporter, so sodium availability is part of how a creatine dose is taken up.

The creatine transporter moves creatine into muscle together with sodium ions, which links sodium status to muscle creatine loading.

Taurine uptake into cells runs on a sodium-coupled carrier, so sodium supply supports how taurine is distributed.

Beta-alanine shares the sodium-dependent TauT carrier with taurine, so sodium availability is part of its transport into muscle.

Glycyrrhizin blocks the enzyme that inactivates cortisol in the kidney, which promotes sodium retention and potassium loss. Stacked on a sodium load the two push blood pressure the same way, so this is an anti-synergy.

Licorice glycyrrhizin drives renal sodium retention while sodium intake adds to the same load, so their effects on fluid balance are additive.

Iodine is conventionally delivered in salt, so choosing an unfortified sea salt over iodised salt changes total iodine intake.

Sea salt and sodium bicarbonate both add sodium to the same extracellular pool, so total sodium load is the sum of the two and not the amount on either label alone. Bicarbonate brings a buffering anion as well, which is the usual reason it is chosen. Anyone tracking sodium intake needs to count both sources.

Blended electrolyte products already carry sodium chloride as their sodium source, usually alongside potassium, magnesium and a carbohydrate. Adding sea salt on top raises the sodium fraction and shifts the sodium to potassium ratio of the finished drink. The point is arithmetic on the total, not a new mechanism.

Glycine crosses the intestinal brush border partly through sodium dependent carriers that use the inward sodium gradient as their driving force. Luminal sodium is therefore part of the machinery, which is the same principle behind sodium and glucose co-transport in oral rehydration. This describes transport, not an added benefit of eating more salt.

Glutamine entry into enterocytes uses sodium coupled neutral amino acid carriers, so the sodium gradient supplies the energy for uptake. Sodium in the lumen is a condition of that transport rather than an additive effect. It is the reason rehydration formulations pair sodium with an absorbable solute.

Sodium and calcium share reabsorption handling in the renal tubule, so a higher sodium load increases the calcium that leaves in urine. A person taking calcium alongside a high salt intake is therefore losing part of what is absorbed. This is a well described renal effect and it is a reason to look at total sodium rather than at the calcium dose alone.

Caffeine causes a modest short lived increase in sodium and water excretion, while sodium intake works in the other direction by supporting extracellular volume. The two are commonly taken together in pre-exercise drinks, where the net fluid balance depends on dose and habituation. Direction of the interaction is clear. The size of it in a habitual caffeine user is not settled.

Sodium loading acts on plasma volume while dietary nitrate acts through the nitrate nitrite nitric oxide route on vascular tone, and endurance formulations often carry both. How the two combine has not been mapped, so this row is a co-formulation note at Early confidence rather than a demonstrated pairing. Nitrate also carries its own sodium when supplied as a sodium salt, which is worth counting.