Supplement analysis backed by scientific evidence · PT

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Limited evidencePhysical performance

Ketone Salts (BHB)

Ketone salts do raise blood beta-hydroxybutyrate, but far less than ketone esters, and the performance literature is overwhelmingly null or negative. They are expensive, salt-loaded, and the marketing promise of "instant ketosis for energy and fat loss" is not supported.

What the science says

  • Improving endurance or high-intensity exercise performance Limited evidence

    Margolis's 2020 systematic review found that ketone supplementation, including salts, did not consistently enhance physical performance, with most trials null and several showing impairment — particularly at higher intensities where ketones compete with carbohydrate oxidation. Racemic ketone salts also deliver a largely inactive D-BHB fraction, roughly halving the useful dose.

  • Lowering blood glucose Moderate evidence

    A 2022 systematic review and meta-analysis found exogenous ketone supplementation significantly reduced circulating blood glucose, with the effect appearing across both salt and ester forms. This is a reproducible acute metabolic effect, but it has not been shown to translate into improved long-term glycaemic control or clinical outcomes.

  • Weight loss and appetite suppression Limited evidence

    Ketone salts do not induce nutritional ketosis in the sense of burning body fat — they supply exogenous ketones while suppressing endogenous ketogenesis and lipolysis. Appetite-suppression data are short-term and inconsistent, and no trial has shown meaningful fat loss from ketone salts without dietary change.

Dosage & safety

Studied doseTypical study doses are 10-25 g of ketone salts providing roughly 6-12 g of BHB, taken 30-60 minutes before exercise; this usually raises blood BHB to only about 0.5-1.0 mmol/L. Ketone esters reach 2-5 mmol/L but taste far worse and cost more.
SafetyThe dominant issue is the mineral load: therapeutic BHB doses come bound to sodium, potassium, calcium and magnesium, and a single serving can deliver over 1 g of sodium — a real concern for anyone with hypertension, heart failure or kidney disease. GI distress (nausea, cramping, diarrhoea) is common and dose-limiting. Not prohibited in sport. People with type 1 diabetes should not use exogenous ketones without medical supervision, since they complicate distinguishing supplement-derived ketosis from ketoacidosis.

Scientific references

Where to buy

Nutricost, BHB Salts, goBHB®, Unflavored, 0.97 lb (442 g)

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