Always mark the reconstitution or opening date on the vial and discard after the stability window expires, regardless of remaining volume
It has been used in medical research for some time and is being studied as a potential treatment for conditions such as Parkinsons Disease, brain injury, wound healing, and joint health
For sustained elevation, regular moderate-to-vigorous cardio lasting 30 to 40 minutes, performed four to five times weekly, maintains elevated BDNF for up to 24 hours after each session
Its thought to work by making more of the milk-producing hormone prolactin
But, heres the brutal truth
As to the aches and pains, breathlessness etc, this could be due to B12 needing potassium to build RBC, so I would check out low potassium symptoms and eat a banana or maybe two until you have fathomed it out