Dr. Formulated Organic Fiber
This is the best value option for those looking for a clean, organic, food-based prebiotic. It uses Acacia fiber, which is known to be much gentler on the stomach than Inulin, and provides a solid 5g of prebiotic fiber per serving at a very accessible price point.
Ingredients & Purity
Features Organic Acacia Fiber, Organic Orange Peel, Organic Baobab Fruit, and Organic Apple Peel. No sugar or grit.
Scientific Evidence
Acacia fiber is clinically shown to increase Bifidobacteria and Lactobacillus levels. It has a high fermentation tolerance, meaning it produces less gas than other fibers.
Brand Transparency
Garden of Life is a B-Corp and utilizes third-party certifications (USDA Organic, NSF) for transparency, though they don't provide batch-specific lab results publicly.
Value Assessment
At roughly $0.70 per serving, this offers the best price-to-quality ratio for a daily fiber-based prebiotic.
Why Not Alternatives?
While not as 'targeted' as HMOs or XOS, it avoids the fillers, artificial sweeteners, and harsh psyllium found in many drugstore fiber brands. It is USDA Organic and Non-GMO Project Verified, which is rare for budget-friendly prebiotics.