Adding a quality control perspective here: poor-quality raw materials can absolutely cause GI distress.
If the manufacturer uses cheap, harsh chemical acids during the extraction process instead of a clean enzymatic hydrolysis, chemical residues or high levels of sodium/sulfites can be left behind in the powder. Our GI tracts are very sensitive to these impurities. This is why you must demand a full Certificate of Analysis (COA) from your bulk supplier to ensure the raw material is highly purified and free of heavy metals and harsh processing aids.
根據我為各大品牌研發產品的經驗，消費者抱怨腹瀉的情況中，90% 次，罪魁禍首並非膠原蛋白，而是輔料。.
許多品牌為了調配出「生酮」或「無糖」風味的膠原蛋白粉，會在產品中大量添加赤藓糖醇、木糖醇或麥芽糖醇等糖醇。這些人工甜味劑素以引發嚴重的胃腸不適及通便作用而惡名昭彰。 若您想要一款成分標示清晰且對胃部溫和的產品，請選擇純粹的無味胜肽，或使用甜葉菊、羅漢果等天然甜味劑。.
Yes, it can happen, but it’s usually dose-dependent. Because true hydrolyzed collagen peptides have extremely high bioavailability, they are absorbed very rapidly in the small intestine. If a consumer takes a massive dose (like 30-40g) on an empty stomach, it can draw excess water into the digestive tract, causing an osmotic effect which leads to loose stools or diarrhea. Advising consumers to stick to a standard 10-15g daily dose usually solves this immediately.