Inject them at different sites (for example, AOD 9604 in the abdomen and tirzepatide in the thigh) and at different times if you prefer
Here are general guidelines for how often you might need Vitamin B12 injections: 1
What side effects might one expect from a B12 injection
The answer should explain that the required volume depends on the target concentration, compound mass, and laboratory protocol design
Kiyoshi Okada, Hiroyuki Tanaka, Ko Temporin, Michio Okamoto, Yusuke Kuroda, Hisao Moritomo, Tsuyoshi Murase, Hideki Yoshikawa, Methylcobalamin increases Erk1/2 and Akt activities through the methylation cycle and promotes nerve regeneration in a rat sciatic nerve injury model, Experimental Neurology, Volume 222, Issue 2, April 2010, Pages 191-203 Tanaka, H