Every few weeks someone emails me a version of the same worry: “I read about BHB salts side effects online. Is this stuff safe to take every day?” It’s a fair question, and the honest answer comes from two places: what the controlled trials recorded, and what’s printed on the label of the tub you’re holding.

I’ve been working with goBHB®, our ingredient, for years, and in my experience the problems people run into are predictable. They take too much too fast, they ignore the mineral load, or they stack a ketone drink on top of a medication without asking their doctor. Below I’ll go through the side effects that showed up in the human studies, the sodium and mineral math for a real product, and who should be more careful.

What BHB Salts Side Effects Showed Up in Trials

The best safety data comes from placebo-controlled trials, because they let you separate real side effects from the normal background noise of people’s lives. Three published trials are most useful here, and all three reported very few problems.

KETAD: 10 g a day for 8 weeks

The KETAD trial, published in Nutrients in 2025, gave overweight and obese adults 5 g of racemic (D/L) BHB mineral salts twice a day, 10 g total, for 8 weeks alongside a calorie deficit of about 500 calories a day. In the published analysis, 3 of 24 people in the BHB group reported a side effect, against 2 of 27 on placebo. Every event was rated mild. On BHB they were digestive: one case of constipation and two of more frequent bowel movements. On placebo it was bloating. Liver enzymes stayed in normal ranges. Ketone Labs funded the study, which I want you to know up front.

The D-BHB trials from Japan

Two trials run by Osaka Gas researchers used smaller amounts of pure D-BHB. In a 2023 study in the Journal of Nutritional Science and Vitaminology, 44 healthy adults took 2.9 g a day or placebo for 12 weeks, with no adverse effects reported. A 2025 follow-up in Obesities randomized 108 adults to 1.5 g, 2.9 g or placebo for 12 weeks and again reported no adverse events. Those are small doses and short timelines, so they tell us about tolerance at modest intakes, not about years of heavy use.

Stomach Upset: The Most Common Complaint

When people do have a problem, it’s almost always their gut. Minerals that aren’t absorbed pull water into the gut, so a big dose of BHB salts on an empty stomach can loosen things up, the same way a large dose of magnesium can. That matches the KETAD pattern of a few mild bowel complaints.

The fix is boring, and it usually works. Start with half a scoop, take it with food or right after a meal for the first week, and mix it in 12 to 16 ounces of water. Split larger daily amounts into two servings, the way KETAD did, instead of taking 10 g at once. If you still get cramping or loose stools after a week at a half dose, BHB salts may not be for you, and that’s fine.

Sodium and Mineral Load in a Real Serving

This is the side of BHB salts I wish more brands talked about. The “salt” in BHB salts means the BHB is bound to minerals, so every scoop delivers calcium, magnesium, sodium and potassium along with the ketone. For most healthy people that’s a feature, which is why we’ve written about how BHB electrolytes support hydration. For someone watching sodium, it’s a number to count.

Here’s the mineral panel for Beyond Raw Chemistry Labs BHB Salts, which GNC sells at $39.99 for 30 servings of 5 g goBHB D-BHB, per Stack3d’s launch report. The sodium line is the one to watch.

Now put the sodium in context. One serving is 210 mg. Two servings, the same 10 g daily total used in KETAD (though KETAD used a D/L blend), is 420 mg. The FDA Daily Value for sodium is 2,300 mg.

For an active person who sweats, 420 mg is easy to absorb into a normal day. For someone on a sodium-restricted plan, it’s about 18% of the Daily Value before they’ve eaten anything, and it belongs in their food log. The same logic applies to calcium and magnesium if you already take those as separate supplements.

CleanForm Nutrition’s goBHB powder spreads its BHB across the same four minerals in a 50/50 D/L blend, and the flavored versions add 20 calories per scoop. If you compete in tested sports, note that the unflavored powder is listed under NSF Certified for Sport, which screens for banned substances and contaminants.

Who Should Be More Careful With BHB Salts

Most healthy adults tolerate BHB salts well at label doses. A few groups should talk with a doctor first. If you have kidney problems or high blood pressure, the mineral load is the issue, and your doctor may already be limiting sodium or potassium. If you take medication that lowers blood sugar, keep in mind that exogenous ketones can lower blood glucose in the short term (more so with ketone esters than salts), which we covered in what 43 trials show about ketones and blood sugar. If you’re pregnant or nursing, there’s no safety data, so skip it unless your doctor says otherwise. Many labels set an age floor too. Nutricost’s goBHB salts, for example, say they’re for healthy individuals 18 years and older.

One more point that causes needless worry: the ketone levels from a supplement serving are modest and short-lived, and healthy people regulate them normally. That’s very different from the runaway ketone buildup seen in diabetic ketoacidosis, which is a medical emergency driven by a lack of insulin. None of these products are meant to treat or prevent any disease.

Where the Evidence Stands

Across these three controlled trials, side effects from BHB salts and D-BHB were rare, mild and mostly digestive, at doses from 1.5 g to 10 g a day for up to 12 weeks. The limits are real. The studies were small, industry-run and short, and none followed people for a year or longer. They also enrolled healthy, overweight or obese adults, so they say little about people with kidney disease, heart conditions or pregnancy. My read is that BHB salts are well tolerated by healthy adults who respect the dose and count the minerals.

FAQ

What are the side effects of BHB salts?

In controlled trials the side effects were uncommon and mild, mostly loose stools, more frequent bowel movements or constipation. In KETAD, 3 of 24 people on 10 g a day reported one, versus 2 of 27 on placebo. Starting with a half serving with food reduces the risk.

Is it safe to take BHB salts every day?

Published trials ran daily dosing for 8 to 12 weeks in healthy and overweight adults without serious safety concerns. Longer studies don’t exist yet. Count the sodium and other minerals if you have blood pressure or kidney concerns.

How much sodium is in BHB salts?

It depends on the product. Beyond Raw BHB Salts lists 210 mg of sodium per 5 g serving, about 9% of the 2,300 mg Daily Value. Check the label of whatever you buy, since some products use more sodium BHB than others.

Can BHB salts cause diarrhea?

Large doses on an empty stomach can, mainly because of the dissolved minerals. Splitting the dose, taking it with food and using plenty of water usually helps.

The Bottom Line

BHB salts side effects are real but small: some stomach upset at higher doses and a mineral load you need to count. The trials we have, at 1.5 g to 10 g a day for up to 12 weeks, found few problems and nothing serious. Start low, read the mineral panel, and if you have kidney, blood pressure or blood sugar concerns, bring the label to your doctor before you start.

Sources: Roeth EJ, et al. Effect of Exogenous Ketones as an Adjunct to Low-Calorie Diet on Metabolic Markers. Nutrients. 2025;17(22):3582 (funded by Ketone Labs). Katsuya S, et al. Daily Intake of D-β-Hydroxybutyric Acid (D-BHB) Reduces Body Fat in Japanese Adult Participants. J Nutr Sci Vitaminol. 2023;69(2):121-128. Katsuya S, et al. Effect of D-β-Hydroxybutyric Acid on Body Fat in Japanese Adults. Obesities. 2025;5(4):82. Falkenhain K, et al. Effects of Exogenous Ketone Supplementation on Blood Glucose: A Systematic Review and Meta-analysis. Adv Nutr. 2022;13(5):1697-1714. Stack3d: Beyond Raw Chemistry Labs BHB Salts (September 2026). Product details from cleanformnutrition.com and Vitacost (Nutricost BHB Salts goBHB).