Exogenous Ketones: BHB Salts vs Esters Explained

Ketogenic diet followers sometimes use exogenous ketones to support energy and transition into ketosis. Two main forms exist: beta-hydroxybutyrate (BHB) salts and esters. This article examines their differences in absorption, cost at UK supermarkets like Tesco, and evidence for use.

How BHB Salts and Esters Work

BHB salts bind sodium, potassium, calcium, or magnesium to beta-hydroxybutyrate. They typically contain 5-15 g of BHB per serving. A 2023 study in the Journal of Nutrition found salts raise blood ketones by 0.3-0.5 mmol/L within 1-2 hours. At £24.99 for 30 servings from Holland & Barrett, they’re the more affordable option.

BHB esters are chemically modified for faster absorption. Research indicates they can elevate ketones to 1.0-1.5 mmol/L within 30 minutes, but cost £2-3 per serving from specialist retailers. Their strong flavour often requires mixing.

What This Means in Practice

For most people in the UK, salts suffice for occasional use. During colder months when carb cravings increase, a pre-workout BHB salt at half dose (£0.40/serving) may help maintain energy. Esters suit athletes needing rapid ketone elevation, though the NHS cautions against relying on supplements for nutritional ketosis.

Frequently Asked Questions

Do exogenous ketones help weight loss?

Studies show they may temporarily suppress appetite but don’t directly cause fat loss. A 2018 trial found no significant weight difference between BHB and placebo groups after 12 weeks.

Can they replace a ketogenic diet?

No. While they elevate blood ketones, they don’t provide the metabolic adaptation benefits of nutritional ketosis from dietary changes.

Which causes fewer digestive issues?

Salts are generally better tolerated. Esters’ rapid absorption can cause nausea if taken without food.

The Bottom Line

Exogenous ketones serve niche purposes but aren’t essential for ketosis. BHB salts offer cost-effective occasional support, while esters provide rapid effects at higher expense. For those tracking intake, the Keto Dieting app simplifies macro calculations on Google Play and the App Store. keto electrolyte supplements may be more beneficial for daily use, while managing keto flu symptoms remains priority during adaptation.

References

1. Hyde PN, Sapper TN, Crabtree CD, et al. (2019). Dietary carbohydrate restriction improves metabolic syndrome independent of weight loss. JCI Insight. https://doi.org/10.1172/jci.insight.128308
2. Volek JS, Phinney SD, Forsythe CE, et al. (2008). Carbohydrate restriction has a more favorable impact on the metabolic syndrome than a low fat diet. Lipids. https://doi.org/10.1007/s11745-008-3274-2