BurnTide's label lists three specific forms of beta-hydroxybutyrate (BHB): calcium BHB, magnesium BHB, and sodium BHB, bound to those minerals to make the ketone salt stable and easier to formulate into a gummy.
BHB is a ketone body your liver naturally produces during states like fasting or a very low-carb diet, and exogenous (supplemented) BHB is the basis of most "keto" gummies and drink mixes on the market.
The core premise behind exogenous BHB supplements is raising blood ketone levels without requiring a strict ketogenic diet, though whether that alone meaningfully supports fat loss independent of diet is still debated in the research, and most studies use doses considerably higher than what a single gummy is likely to provide.
Where it sits in the formula: one of two ingredients in BurnTide's 525mg blend, alongside Apple Cider Vinegar.