For a Jain-friendly protein powder, the safest choice is usually a plain plant-based powder made from pea, rice, soy, hemp, or chickpea protein, and avoiding yeast/fungus-based powders. A Jain source also notes to avoid blends with roots, fungi, algae, probiotics, and to check that any whey is truly vegetarian if you choose it at all. ( jainknowledge.com)

Good options to look for:

• Optimum Nutrition Gold Standard 100% Plant-Based — made from pea and rice protein. ( optimumnutrition.com)
• Vega Essential Protein — a pea-protein based vegan powder. ( myvega.com)
• Gainful Lean Plant Protein — uses brown rice and pea protein. ( gainful.com)
• Horleys Plant Pro Vegan Protein — a pea and rice protein blend. ( horleys.com)
• AlpenPower Bio Vegan Protein — organic pea protein and rice protein. ( en.alpenpower.com)

My simple Jain recommendation: Choose unflavored pea + rice protein with a short ingredient list, and make sure it has no yeast, gelatin, egg, animal enzymes, probiotics, or root-based additives. ( jainknowledge.com)

If you want, I can also give you a Jain-friendly shortlist by country/price.