The best option likely varies from person to person and depends on what its being used for
Use a short needle, typically 4mm to 8mm length
Vitamin B12 shots are generally considered to be safe and have no major side effects
Products sold online without a prescription requirement, through general retail platforms, or without third-party testing documentation are often unreliable in purity, inaccurate in concentration, or in some cases unsafe due to contamination
Unexpectedly high B12 levels without supplementation warrant GP review as they may indicate underlying liver disease, kidney disease, or blood disorders
Transparent glass: We use clear, premium glass bottles instead of cheap plastic, or amber-colored glass where you're unable to see the contents inside