4 ms·You don't. Such is life.by rapsey 1y agoYou don't. Such is life.amelius 1y agoI mean, you could take a blood sample and send it to a lab, at least once? But I'm curious what the easiest way would be.rapsey 1y agoMy life improved immensely after B6 supplementation, never once has a blood test shown I am deficient.amelius 1y agoIt might still be a good idea to check if your level is now too high ...