Been using it for 5.5 weeks now, started at 1mg a week split in two doses for the first 4.5 weeks then went to 1.4mg last Tuesday, and my heart rate hasn't really moved. I lift heavy four days a week plus one long hike, same as the last ten years, and resting rate sits around 48-52 normally but has been 54-55 lately while max during activity went from 165 up to 169-170.
From what I've seen on the internet, this stuff might boost heart rate quite a bit and make it feel off. Wondering what experiences others have had with it.