Inflammatory Bowel Disease (IBD), like Crohns disease and ulcerative colitis, glutamine has shown promise in reducing inflammation, supporting gut repair, and alleviating symptoms
Skin condition, allergy to copper, and active dermatologic issues change the answer
The reality is that that what the FDA means by safety is a matter of regulatory compliance (large scale clinical trials, manufacturing standards, etc.) not toxicity
However, if you find that it causes a slight "heavy" feeling in your stomach, try taking it alongside a small snack
They are grouped as a research convenience, allowing researchers to work with a consistent, standardised composition and reducing variability associated with separate sample preparation in the laboratory