But, before frustration sparks at yet another suggestion of more sleep, consider this according to NHS UK, extreme tiredness, a lack of energy, and problems with your memory, understanding and judgement could be signs that you are lacking in Vitamin B12
They are quick and usually done by a healthcare professional
Injections may be discussed for more body-wide effects, but the route should be clinician-led
duration = cancer-active period or indefinite HIT (heparin-induced thrombocytopenia): Stop all heparin products
Schnzer W, Thevis M
Chang, C.-H., Tsai, W.-C., Hsu, Y.-H., & Su Pang, J.-H