Source quality matters tremendously always use pharmaceutical-grade products from reputable suppliers
The typical maintenance dose is 1,000 mcg administered IM once monthly
Sinha DK, Balasubramanian A, Tatem AJ, Rivera-Mirabal J, Yu J, Kovac J, Pastuszak AW, Lipshultz LI
Can Vitamin B complex injections help with fatigue
Can this be part of a regular wellness routine
You should always opt for stocking up on pure and efficient methylcobalamin-based B12, making sure to read the ingredients label carefully for any hidden nasties, and reach for a daily dose that will meet your requirements, plus some to ensure absorption (2000mcg weeky for adults under 65 should do the job just fine!)