sublingual vs injection b12 Efficacy of versus oral vitamin supplementation for the treatment of vitamin B12 deficiency–A prospective randomised open label study Sublingual B12 vs. B12 Injections:
Description
The break is not required for safety or receptor resensitization, but it allows for reassessment and prevents indefinite use of a compound with limited long-term human data

Many patients notice significant improvements in their energy and overall well-being after starting treatment

Semaglutide for managing overweight and obesity (TA875) Chapter 1: Recommendations

I have had zero negative side effects

For your age, B12 levels typically range between 200-900 pg/mL, but levels above 1000 pg/mL can occur due to supplementation