If none of those apply and you eat a varied diet that includes animal products, your B12 status is less likely to be a concern during treatment
There is no direct trek between the two (like the one from Choquequirao to Vilcabamba, which is very advanced), but many do it as part of a longer trip through southern Peru
A 2021 systematic review of 16 randomized controlled trials and 6,276 participants (Markun and colleagues, Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue, Nutrients, 2021) found that B12 supplementation does not reliably reduce fatigue in people who are not deficient
The Effect of Levels of Protein and Vitamin B12 in Hen Diets on Egg Production and Hatchability of Eggs and on Livability and Growth of Chicks
So, you measure a higher B12, but part of that B12 is inactive, so useless Oral B12 supplementation, even in the form of a multivitamin preparation, may result in serum B12 concentrations just within the normal range without abolishing symptoms
Label every reconstituted vial with reconstitution date, concentration in mg/mL, and 28-day expiration date