Pure Encapsulations PureLean® Fiber

Your training plan is dialed. Your fueling strategy is locked in. But if your gut can't efficiently absorb nutrients, regulate blood sugar, and keep your microbiome balanced, you're leaving performance (and health) on the table. Most endurance athletes get barely half the daily fiber they need — and that gap shows up as erratic energy, sluggish digestion, and slower recovery between sessions.

Pure Encapsulations PureLean® Fiber delivers 6+ grams of prebiotic and dietary fiber per serving from a carefully blended mix of soluble and insoluble sources — designed to strengthen your gut foundation so everything else in your nutrition plan works harder.

Smarter Blood Sugar Management – The soluble fiber blend (glucomannan, guar gum, apple pectin, prune fiber) forms a gel-like barrier in your digestive tract that slows sugar absorption. That means fewer spikes and crashes during long training days and more consistent energy from the food you're already eating.

A Stronger, More Resilient Microbiome – PureLean® Fiber includes 700mg of PreticX™ xylooligosaccharides, a clinically studied prebiotic shown to increase beneficial Bifidobacterium counts by 21% without the gas or bloating that many fiber supplements cause. A healthier microbiome means better nutrient absorption, stronger immune function, and improved gut-barrier integrity — all critical when you're pushing volume.

Clean Digestion Without the GI Drama – The insoluble fiber from flaxseed and cellulose keeps things moving efficiently while the soluble fibers add bulk and promote regularity. This dual-action approach supports comfortable digestion so you're not dealing with surprises on race morning.

The science here is straightforward. Short-chain fatty acids (SCFAs) — the compounds your gut bacteria produce when they ferment soluble fiber — strengthen your intestinal lining, reduce inflammation, and emerging research suggests they may support glycogen storage and carbohydrate metabolism in skeletal muscle. PureLean® Fiber gives your gut bacteria the fuel they need to produce these performance-supporting compounds daily.

How to Use PureLean® Fiber

Mix 2 scoops (one serving) with 8–12 oz of water, coffee, or your preferred beverage. Take 1–2 times daily. 

Take in the morning or between meals. Avoid consuming within 2 hours of hard training to prevent GI discomfort. 

Pro Tip: If you're new to fiber supplementation, start with one scoop for the first week and build to the full serving. Drink plenty of water throughout the day — fiber works best when you stay hydrated.