Burntide Ingredients: What Is in Each Gummy

What it is. Apple juice fermented twice, first to alcohol and then to acetic acid. Acetic acid is the part that does anything, and a typical table vinegar is about 5 per cent acetic acid by volume. In a gummy the vinegar has been dried onto a carrier, because liquid vinegar cannot be set into a chewable.

What the research used. Liquid vinegar, by the tablespoon, with or just before a meal. Ostman and colleagues gave vinegar with a bread meal and measured lower glucose and insulin responses and higher reported satiety. Johnston and colleagues reported improved insulin sensitivity to a high-carbohydrate meal. Kondo and colleagues ran the best-known twelve-week trial, at 15 and 30 mL a day, and reported small reductions in body weight and body fat. A pilot study in type 1 diabetes found slower gastric emptying.

How the evidence has held up. A 2020 systematic review looked at safety, side effects and metabolic parameters together and concluded the evidence base is small and mixed. A 2025 dose-response meta-analysis in type 2 diabetes found effects on glycaemic control that depended on dose, which is precisely the finding that makes an undeclared amount a problem.

What that means here. The whole blend is 525 mg. A tablespoon of vinegar carries roughly 750 mg of acetic acid on its own, before you count the water it arrives in. Even if every milligram of the blend were vinegar solids, the acetic acid delivered would be a fraction of a tablespoon. This gummy is not a substitute for the dose the trials used, and nobody has tested whether a fraction of it does anything.

Sources: Kondo 2009, Johnston 2004, Ostman 2005, Hlebowicz 2007, the 2020 systematic review, a 2025 dose-response meta-analysis.

What it is. Beta-hydroxybutyrate is a ketone body, one of the fuels the liver makes when carbohydrate is scarce. On its own it is an acid, so it is sold bound to a mineral: calcium, magnesium or sodium. All three appear on this label, named together on one line inside the blend.

What the research used. Grams. Stubbs and colleagues mapped what happens to blood ketones after ketone ester and salt drinks and used multi-gram servings to do it. A follow-up found a ketone ester drink lowered ghrelin and reported appetite, again at a dose measured in grams. Evans and colleagues reviewed the physiology for exercise, and the 2022 Sports Medicine review surveyed the field. Newman and Verdin set out the case for beta-hydroxybutyrate as a signalling molecule rather than only a fuel, which is the mechanism by which a small amount might in principle matter.

What that means here. The panel does not say how much salt is in the blend. The three mineral rows constrain it: if all the declared calcium, magnesium and sodium comes from the salts, they weigh about 27 mg between them and carry about 23 mg of beta-hydroxybutyrate. That arithmetic is set out in full on the panel page, assumption included. Against a 10 to 25 gram research serving it is around a thousandth.

Safety of the ingredient itself. A 28-day study of sustained exogenous ketosis in healthy adults found ketone monoester drinks tolerable at doses hundreds of times larger than anything in this jar. That is genuinely reassuring about the molecule and says nothing about whether this amount of it does anything.

Sources: Stubbs 2017, Stubbs 2018, Newman and Verdin 2017, the 2022 Sports Medicine review, Evans 2017, Soto-Mota 2019.

One milligram, against a Daily Value of 1,300 mg. It is on the panel because it is the mineral half of one of the ketone salts, not because Burntide is a calcium supplement. The NIH calcium fact sheet sets out what an adult actually needs and where it usually comes from.

If you are taking a calcium supplement or being monitored for calcium, this jar changes nothing and you should still mention it.

Source: the ODS calcium fact sheet.

Three quarters of a milligram, against a Daily Value of 420 mg. The smallest number on the panel and the one most often misread as a magnesium supplement. The NIH magnesium fact sheet gives the reference intakes.

Magnesium in larger amounts has a laxative effect. At 0.75 mg there is no plausible route to one, which is worth saying because it is a common worry with mineral-containing gummies.

Source: the ODS magnesium fact sheet.

Two and a half milligrams against a 2,300 mg Daily Value. This is the one mineral row with two possible sources: the sodium BHB salt inside the blend, and the sodium citrate on the Other Ingredients line. The label does not separate them, which is why the salt arithmetic on this website treats the sodium step as its weakest.

The FDA and the CDC both frame sodium as a ceiling rather than a target. 2.5 mg a day is negligible against that ceiling and is still worth mentioning if somebody is counting it with you.

Sources: the FDA on sodium, the CDC.