Pure Encapsulations L-Glutamine 850mg

As the most abundant amino acid in your body, glutamine fuels your gut lining, powers your immune cells, and supports muscle repair — but prolonged endurance exercise can drop your levels by 20% or more. Hard training depletes glutamine faster than your body can make it. When that happens, your gut barrier weakens, your immune system dips, and recovery slows down. That's a recipe for missed training days in your future.

Pure Encapsulations L-Glutamine 850mg delivers a potent dose of free-form L-glutamine to replenish what training takes away and keep your body's recovery systems running at full capacity.

Repairs and Strengthens Your Gut Lining – Your intestinal wall takes a beating during hard efforts, especially in the heat. Glutamine is the primary fuel source for the cells lining your GI tract, helping maintain the protective mucosal barrier that keeps your gut functioning and your nutrition absorbing properly. Fewer GI issues on race day, fewer problems during training.

Supports Immune Function – Research on marathon and ultra-marathon runners shows that glutamine levels plummet after exhaustive exercise, right when your immune system is most suppressed. Supplementing post-exercise has been shown to support healthy immune cell activity and may help reduce the incidence of upper respiratory infections during heavy training blocks.

Preserves Lean Muscle – When your body runs low on glutamine, it pulls it from muscle tissue. Supplementing helps protect your hard-earned muscle mass during periods of intense or prolonged endurance training, supporting tissue repair and reducing markers of muscle damage like soreness and elevated CK levels.

Glutamine also supports glycogen synthesis during recovery, helping your muscles refuel more efficiently after long sessions. And because it promotes sodium and water absorption in the gut, it can even support better rehydration.

How to Use Pure Encapsulations L-Glutamine 850mg

Daily dose: Take 1 capsule, 1–3 times daily, between meals.

Timing: Post-workout is the most critical window. Take one capsule immediately after training, then additional capsules between meals throughout the day.

Pro tip: For heavy training blocks or race weeks, take the full 3-capsule daily dose (2,550mg) to keep glutamine levels topped off when demand is highest.