A friend showed me Avrox Ei8ht which is a sachet of powder you mix with water and shake to create small bubbles. These bubbles then (allegedly) increase the transport of oxygen in your bloodstream. Avrox Ei8ht claims 6.6% increase in peak power and 37 seconds faster over 10-mile TT. Their study seem yet to be publish from what I can find. One quote on their webpage even claims seeing a 4-10% increase in FTP.
Have anybody tried this? Or know something more?
Seem really impressive if it works as advertised.