Yes, but it requires liquid chromatography-tandem mass spectrometry (LC-MS/MS) with a lower limit of quantification around 15 ng/mL, and samples must be collected within two to four hours post-administration to capture measurable concentrations given the short dihexa half life
2003 Jul-Aug;27(4):315-8
This nutrient plays a pivotal role in the production of red blood cells, DNA synthesis, and nerve function
If drinking: limit to 1-2 drinks maximum, never on an empty stomach, drink water between alcoholic beverages, avoid during peak side effect period (weeks 4-8)
Not enough B12 is a cause of fatigue, poor cognitive function, and is linked to increased cancer risk
Injection-Site Considerations Injection-site decisions should be made by a healthcare professional