How to Keep Yourself Cold Free

Individuals who engage in heavy training lower the amount of L-Glutamine in their body. Which in turn makes them more susceptible to colds and infections. Taking between 20-30 grams Glutamine every day will minimize your vulnerability to colds and infections. Spread the dosage 2-4 times a day. Glutamine even helps the digestive system function better and heal injuries. It's so effective they even use it on burn victims (healing) and individuals with HIV/AIDS (gaining muscle mass by absorbing nutrients more effectively).

Dietary Sources

• beef
• pork
• poultry
• dairy products
• raw spinach
• raw parsley
• cabbage

Sources: 
http://www.ncbi.nlm.nih.gov/pubmed/18806122 
https://umm.edu/health/medical/altmed/supplement/glutamine