Your detailed explanation on the preference of injection over oral administration for pain relief, particularly discussing intravenous and intramuscular methods, is informative. Additionally, your insights into why vitamin B12 is often recommended through injections and the alternative methods for those averse to pills or injections are comprehensive. It's valuable to consider various pain relief options, such as topical treatments, physical therapy, heat and cold therapy, and mind-body techniques. Each individual can choose what suits them best.