Beta-hydroxybutyrate
Useful mainly for people wanting to transiently raise blood ketones outside of fasting or a ketogenic diet.
Quick decision guide
May help most
people wanting to transiently raise blood ketones outside of fasting or a ketogenic diet
Common dosing range
6–12 g BHB per serving (salts); 25–50 g (esters, research)
When to expect effects
Acute (30–60 minutes)
Watch out for
Ketone salts add a large mineral (sodium/calcium/magnesium) load
What is it
Beta-hydroxybutyrate (BHB) is a ketone body produced by the liver during fasting, prolonged exercise, or ketogenic diets. Supplements provide BHB as exogenous ketone salts or esters.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
acute elevation of blood ketones Good Evidence | Salts ~0.5–1.5 mmol/L for 1–2 hours; esters higher | people deliberately raising blood ketones outside fasting/keto | 30–60 minutes |
exercise performance Mixed Evidence | No consistent benefit | none clearly identified | Acute |
acute elevation of blood ketones
- Effect
- Salts ~0.5–1.5 mmol/L for 1–2 hours; esters higher
- Best fit
- people deliberately raising blood ketones outside fasting/keto
- Time
- 30–60 minutes
exercise performance
- Effect
- No consistent benefit
- Best fit
- none clearly identified
- Time
- Acute
Evidence for 2 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
acute elevation of blood ketones
Biomarker supportExogenous BHB salts reliably raise blood ketone concentrations modestly and transiently (roughly 0.5–1.5 mmol/L for an hour or two), and ketone esters can reach higher levels. This is purely a biomarker change. Raising blood ketones does not by itself establish any performance, weight, or clinical benefit.
Bottom line: BHB supplements reliably raise blood ketones, but that elevation is a marker, not a proven clinical or performance benefit.
exercise performance
Supplement benefitTrials of exogenous ketones for exercise performance are conflicting, with most showing no clear benefit and some showing GI side effects that impair performance. Despite raising blood ketones, there is no consistent ergogenic effect. The evidence does not support performance claims.
Bottom line: Exogenous ketones do not reliably improve exercise performance.
Evidence is mixed
A few studies suggest situational metabolic effects, but most controlled trials show no performance benefit and sometimes GI-related impairment.
How it works
How to take it
What to track
2 commercial forms
Compare the main delivery options and what they’re best suited for.
BHB salts (Ca, Na, Mg, K)
Most common supplement form.
Well absorbed; raises blood BHB modestly and transiently.
Ketone esters
Used in research and specialized settings.
Higher blood ketone levels achievable but expensive and often unpalatable.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Who should avoid it
- people with hypertension, heart failure, or kidney disease (mineral load from salts)
- people with type 1 diabetes without medical advice
Pregnancy & breastfeeding
Insufficient data; avoid in pregnancy and breastfeeding.
Interactions
mineral (sodium) load from ketone salts may interact with blood-pressure and electrolyte management
Food sources
| Food | Amount | %DV |
|---|---|---|
| Not found in food in meaningful amounts | n/a | — |
Not found in food in meaningful amounts
- Amount
- n/a
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Do BHB supplements put me into ketosis?⌄
They raise blood ketones temporarily but do not change underlying metabolism. They do not replicate the metabolic state of a ketogenic diet or fasting.
Will exogenous ketones help me lose weight?⌄
Evidence is limited and mixed. Ketones add calories. Supplements have not been shown to drive meaningful weight loss without diet changes.
References by claim
Track Beta-hydroxybutyrate with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.