Is your B12 source synthetic or natural? September 20, 2024 17:24 Updated Methylcobalamin is a natural source of B12 with non-stimulant energy boosters. Related articles Could you please give me information regarding the producer of the B12 supplement? Is the B12 pharmaceutical grade? Are there any side effects from taking my B12 Injection? How long does a syringe last for? Can I order over the phone?