Feeling weak, tired or off balance? Wondering if vitamin deficiencies could be affecting your mental health? This home health test measures the vitamin B12 and folate (vitamin B9) levels in your blood. These nutrients are essential for maintaining healthy cells, and they help make your brain's neurotransmitters that control your mood, focus and energy levels. Results within 24 hours once the lab has your sample. Finger prick collection method. CLIA-certified labs. Ages 18 and up.