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Metformin use for healthy adults

What are your thoughts on healthy adults (age 40+) utilizing Metformin to manage weight? I'm 6' 2" and weight about 200 lbs. I'm also very active, and workout daily. I've read a number of articles regarding the beneficial use, maybe even life extending benefits of Metformin. Is there any strong clinical data to suggest Metformin should/should not be taken by non-obese, non pre-diabetic individuals? Will using Metformin help better manage weight gain for those who are trying to keep off the extra 4-5 lbs that invariably find a way to stick if one isn't strictly following a diet protocol?

Yerba Mate Caffeine

Do you have data on Yerba Mate caffeine content when brewed using traditional method and refilling water? Specifically how caffeine do you consume if you refill 5 times? Is it 5x as much as original pour?

Yerba Mate Caffeine

Do you have data on Yerba Mate caffeine content when brewed using traditional method and refilling water? Specifically how caffeine do you consume if you refill 5 times? Is it 5x as much as original pour?

Protocols for connective tissue disorder and Palindromic rheumatism

What are the most productive protocols and supplements for managing and potentially receiving improvement from connective tissue disorder and Palindromic rheumatism for a very active person?

Cold Exposure Before Exercise

What are your thoughts on cold exposure early in the AM before any exercise? Joe Rogan mentioned on a recent podcast that he was discussing this protocol with you and it has benefits. I am aware you don't recommend it after exercise but do the same negative affects (adaptation from endurance/strength work) apply if the cold exposure is done before the workout(s) and are there any benefits to doing it before?