Short answer: NCCIH reports the weight evidence is not conclusive. Where effects appeared, it was mainly at doses above 1 gram per day for more than 8 weeks — and many of those studies carried a high risk of bias with inconsistent results.
On berberine specifically
NCCIH reports the weight evidence is not conclusive, with effects appearing mainly at doses above 1 gram per day for more than 8 weeks, in studies with a high risk of bias.
On chromium specifically
The NIH Office of Dietary Supplements is direct about it: any potential benefit from chromium supplementation appears to be very small, and more research is needed.
Why citing federal sources directly is a genuinely honest practice
Stated as the NIH sources state it, including the parts that do not help sell gummies — a direct commitment to accurate representation rather than selective, favorable quoting.
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