My husband's B12 was low despite eating meat regularly, so I bought this sublingual B12 supplement for him. He loved it because it tasted great and gave him extra energy. I took it a few times as well and also felt extra energy and a better mood. B12 is know for it's mood boosting properties, and depression is often linked to vitamin B12 deficiency. People with gluten intolerance also often can't absorb B12 from food properly, so eating meat or even being on the Paleo diet, often isn't enough. This supplement is great for those that struggle to get enough vitamin B12 from food or for those who are vegan or vegetarian.