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Although beta-glucan is generally considered safe, there's some concern that it may lower blood sugar. While a benefit in some cases, this can be dangerous in others. People with hypoglycemia or anyone taking medications to reduce blood sugar should consult a physician before using beta-glucan.
People who eat a low-fiber diet should start with a lower dose of beta-glucan and increase it gradually. Like all sources of fiber, it may cause gastric distress, bloating, and gas if taken in larger-than-normal doses. The side effects should wear off over time, but slowly introducing it can help you avoid this.
Supplements haven't been tested for safety. And since dietary supplements are largely unregulated, the content of some products may differ from what is specified on their product labels.
Also keep in mind that the safety of supplements in pregnant women, nursing mothers, children, and those with medical conditions or who are taking medications has not been established. *
