In my experience formulating for major brands, 90% of the time consumers complain about diarrhea, the collagen isn’t the culprit—the excipients are.
Many brands want to formulate “Keto” or “Sugar-Free” flavored collagen powders, so they load them up with sugar alcohols like erythritol, xylitol, or maltitol. Those artificial sweeteners are notorious for causing severe GI distress and laxative effects. If you want a clean label product that is gentle on the stomach, stick to pure unflavored peptides or use natural sweeteners like stevia or monk fruit.
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