Theres currently no established upper intake limit for Vitamin B2, as toxicity cases are extremely uncommon
The primary concerns include additive effects on blood glucose (potentially increasing hypoglycaemia risk), intensified gastrointestinal side effects such as nausea and diarrhoea, and unpredictable interactions due to variable quality of berberine supplements
doi: 10.3390/ijms232415980 29 StefanovSRAndonovaVY
These hormones usually "tell" your body to release insulin, which lowers blood sugar and prevents the release of sugar-raising hormones
Furthermore, there are many healthcare practitioners that hazardly prescribe this medication without appropriate lab testing nor evaluation
Dermoscopy may show brown or black globules, homogeneous or irregular lines, zigzag lines, proximal periungual pigmentation resembling Hutchinson sign, and distal fibrillar brush pigmentation (Fig