Hi! I supplement with B12, specifically DEVA brand B12 supplements (or sometimes the multivitamin). DEVA's B12 sublingual tastes really good and taking a sublingual/chewable tablet helps absorption.
Please supplement with B12. B12 deficiency is a very real and awful problem. It can take a while to manifest and the symptoms are not already clear so it's possible for permanent damage to be done before it is properly diagnosed. Supplements might not be "natural", but then neither is using computers. And health is far more important that being "natural". If you want natural, you could eat your feces like some other species do, but I really don't recommend that.
There are a lot of myths about where you can get B12, but the only reliable source for enough B12 is supplements. Fortified foods are good, but generally not raw and they are less than reliable because batches can vary. Also, stuff like nutritional yeast is not always fortified with B12. Other sources of B12 are even less reliable and mostly contain analogs that were once thought to be usable B12 (hence much of the confusion). We now know that such analogs do raise B12 levels for the purposes of blood tests but do not clear up B12 deficiency. So, not only is it not usable B12, it can give you misleading results on blood tests AND it might also reduce use of B12 -- something to keep in mind if you do eat a lot of food with B12 analogs.
Please, please, please read up on this topic and encourage others to read this. It breaks my heart to see vegans, vegetarians and raw foodists needlessly suffering from B12 deficiency. It not only hurts them, which is certainly bad enough, it also leads to more people believing that plant-based diets are dangerous.