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A daily dose of 250mg to 500mg may reduce wrinkles, improve skin elasticity, and lighten skin pigmentation

Pharmaceuticals (Basel) 13 , (2020)

Mice fed a high-fat diet for 4 weeks showed a three- to fourfold increase in serum LPS, which is defined as metabolic endotoxemia

Lactate then gets shuttled into neurons, and the reason why neurons like that is because it's thermodynamically favorable, much like beta-hydroxybutyrate which you mentioned, BHB, because it can shunt right into the TCA cycle in the mitochondria

As with any supplement, starting at the lower end of the recommended range and gradually increasing as needed is often advisable