I've been suffering from severe ME/CFS for over a decade. One of the best things that's helped me on my healing journey has been B12 injections as prescribed by a fantastic Private Doctor. When sublingual sprays came along, she felt they were as good as the injections - and much to my relief, they are! Then I found the Methylated form - this really helps me to keep going and keep my head clearer! Great product, no sweetners or any other baddies which aggrivate my multiple allergies, naturally tasty, lasts for ages and I can feel that I get full absorbtion - so great value! I can't recommend this product enough!