Easy to carry out at home The cerascreen vitamin B12 test is a sampling and mail-in test kit that determines and evaluates the adequate supply of the vitamin. A few drops of blood are enough to determine the concentration. The sample can then be sent to a specialist diagnostic laboratory free of charge and a detailed report with the results and recommendations will be available in the personal online customer area within a few days. Vitamin B12 can help support physical performance and a deficiency can lead to tiredness, fatigue and difficulty concentrating. The ceracreen vitamin B12 test kit consists of comprehensive instructions, a blood collection kit, a stamped return envelope and an activation card with the test ID for registering the test.