A standalone B12 injection primarily addresses energy levels, red blood cell production, and neurological function
Designed solely for parenteral use (drug administration by intravenous, intramuscular, or subcutaneous injection) following the addition of drugs that require dilution or must be dissolved in an aqueous vehicle prior to injecting
Folate levels are measured using serum or plasma samples, which provide insight into immediate or longer-term folate levels, respectively
The key difference may be that endurance athletes more acutely feel the effects of suboptimal B12 levels during long training sessions
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So, if you're low in B12, then fatigue and general weakness are going to be one of the main symptoms