@littleoreo2021,
From what I’ve read, if you have been on 125mcg for awhile and still feeling very tired, it might mean your dose needs to be adjusted. If you have not been on that dose for very long, it might mean that your body has not adjusted to the doses yet.
Another thing to consider is when you are taking the dose…. It should be taken on an empty stomach, an hour before you eat and vitamins should not be taken for 4 hours…. Antacids also need to be spaced out from it. You might want to check with pharmacist on the best way to take the medicine so you get the benefits.
Good luck!