had b12 injection but still tired My Opinion on shots for post COVID Fatigue Feeling worse after B12 Injection:

Biotin Caution With Lab & At-Home Tests June 02, 2023 High doses of biotin from supplements can interfere with a wide range of laboratory and at-home tests, including those for pregnancy, doping, COVID, and heart attacks

The Journal of Nutrition, Health & Aging

That may include: better overall energy and productivity more consistent fat loss progress fewer start and stop cycles improved mood and motivation At this stage, many people continue injections as part of their wellness routine, especially if they notice they feel more like themselves when they stay consistent

What About Simply Feeling Worse Off

AMJ 10(3):199201 Masuda A, Koki H, Toshihiko S, Yusuke I (1996) Pink urine during propofol anesthesia

Those principles carry over neatly to peptides like AHK-Cu, where stability and compatibility under physiological conditions are critical