Thorne L-Glutamine Review

This product gives 1,500 milligrams of glutamine a day, well below the 10 grams a day that helped in athlete studies, so results from those studies may not apply at this dose. Study results for immune support are mixed. A review of 47 trials in 6,198 critically ill adults found glutamine did not reduce hospital deaths overall, though it shortened time on a ventilator and helped severely burned patients ^[1]. A review of 30 trials in 3,696 intensive care patients found no change in infections or deaths ^[2], and a trial of 502 critically ill adults given 20.2 grams a day saw no fewer infections ^[3]. A review of 25 trials in athletes found no general effect on immune function ^[4]. Some groups did better. In 2,201 colorectal cancer surgery patients, glutamine raised antibody and helper T cell levels and lowered wound infections ^[5]. In 1,035 people with severe pancreatitis, glutamine given by vein reduced infections and deaths ^[6]. Many of these benefits came from glutamine given by vein in hospital patients, not from capsules taken by healthy people. Animal and cell studies are never counted.

Most of the panel recommends or uses glutamine, and the main reason is gut health: eight of the ten talked about healing the gut lining, easing leaky gut, or supporting the gut barrier. Other reasons include supporting immune function when traveling, sick or short on sleep, cutting sugar cravings, recovery after training, and a calming effect during stress. Doses came from a few of them: about 5 grams a day as a baseline, rising to 15 to 20 grams when sleep-deprived or exposed to illness, 5 grams with each meal for four to eight weeks for gut problems, and a teaspoon twice a day for sugar cravings. Powder was the form mentioned most often, and one panelist blends it into a recovery smoothie with whey protein isolate, glucosamine and flaxseed oil. Cautions came up too: avoid it close to bedtime because it is stimulating and can disrupt sleep, skip it during a fasting phase because it can break ketosis, one advises against regular daily use, and one notes that tumor cells use it as fuel, so it needs care with cancer meds.

The studies are mixed rather than showing glutamine does not work: large reviews in critically ill patients and athletes found no benefit, while reviews in colorectal surgery and severe pancreatitis found fewer infections, so the evidence supports tier 4, not tier 5. So it is graded Tier 4, as the studies disagree.

Combine with: To enhance the benefits of L-Glutamine, especially for gut health and immune support, consider combining it with probiotics and prebiotics to foster a balanced gut microbiome. Digestive enzymes can further aid nutrient absorption and reduce digestive stress. Additionally, collagen peptides can support the integrity of the gut lining, while zinc and vitamin D are crucial for robust immune function. Omega-3 fatty acids can provide anti-inflammatory support, complementing L-Glutamine's role in maintaining overall gut and immune health.