I read an article similar to this that claims Caffeine both a Vaosconstrictor AND a Vasodilator…
Quote: "So a little education. Caffeine is both a Vasoconstrictor and a Vasodilator. Great but what does that mean? Well it acts as a Vasoconstrictor (constricts blood vessels) to the muscles in the head and neck only, which is why it is so helpful for headaches. When you get a headache is typically a rush of blood to brain blood vessels causing them to swell and that pressure against your skull is the “ache”, caffeine can help control this by shrinking the vessels back down. And as a migraine suffer it does work! The strange paradox is too much caffeine can actually caused “rebound” headaches but as long as you keep your dosage normal you should be fine.
Now it is also a Vasodialator (expands blood vessels) but this is to the rest of the body. Caffeine has three metabolites (by-products) one of which is Theobromine which when broken down by the liver causes a dilation or opening effect of blood vessels to a majority of the body. This is where it would come into play pre-workout as it can help with the “pump” or delivery of blood flow to the muscles. This is also why you see it in so many NO (nitrous oxide) pre workout supplements, but more on those later" http://www.bodysolutionskc.com/personal-training-information/articles/what-is-the-deal-with-caffeine/
True or not, I don't know. Coffee does not seem to raise my blood pressure or create ED problems for me.
54 years old
Autoimmune Hashimoto's, near zero natural T production
Cause: severe mononucleosis in my early 30's
Height 5' 10"
Very active, daily workouts and some cardio.
Topical 0.75g compounded 10% T cream, rotated daily to shaved armpits, shaved shoulders, remainder on scrotum
190mg NPthyroid (natural dessicated pigs thyroid)
Labs (Oct 2017) , my T=730, TSH 0.03, T3+T4 mid-range normal.
Daily workouts with weights, low-glycemic diet, high in clean protein, very low carb (salad/fish/low fat meats, uncooked veggies, nothing else, ever) Carbs/starch can cause me to have intestinal problems, so I avoid them.