Most ‘best protein for stomach issues’ articles give one generic answer. This one organises by actual symptom, since bloating, gas, cramping and nausea often point to different underlying causes and different fixes.
If it's bloating
Often linked to lactose (if you're using whey), or to the natural fermentable compounds in under-processed plant protein (see Week 2's gas post). A well-processed, isolate-grade, dairy-free blend is the most common fix.
If it's gas specifically
Usually the gut bacteria fermentation process covered in Week 2's faba bean gas post — gradual introduction and taking protein with food are the two most effective practical fixes, regardless of which plant protein you're using.
If it's cramping
Less common, and worth paying closer attention to — if cramping is significant or persistent, that's a signal to check with a doctor rather than simply switching products, since it can indicate something beyond typical adjustment-period discomfort.
If it's nausea
Often related to drinking a shake too quickly, on a completely empty stomach, or too soon before or after intense exercise — practical timing adjustments often resolve this before it's a formulation issue at all.
When to stop self-diagnosing and check with a professional
If any of these symptoms are severe, persistent beyond two to three weeks of trying practical fixes, or accompanied by other concerning symptoms, that's the point to see a doctor rather than keep testing different protein powders.
This article is general nutrition information, not medical advice. Protein, sugar and label figures reflect GC Proteins' published nutrition panel; always check the pack in front of you, since formulations can be updated. Speak with a doctor or accredited dietitian about your individual protein needs.