There arent specific meds that cant be taken with B12
This is exactly why you cannot use someone elses unit count, and why how many units do you take? is a meaningless question in a Facebook group

The acetylated form of L-Carnitine is primarily found as AcetylLCarnitine hydrochloride (or may be listed on the label as (N-Acetyl L-Carnitine HCI). ALCAR Formats ALCAR is available primarily in capsule form, as well as powders, and can also be found in cardiovascular support complexes The L-Carnitine form can be found in capsule, powder and liquid form. Choosing the Right Acetyl-L-Carnitine for You You should take your ALCAR supplement away from meals to maximize absorption If you take ALCAR for longer than a month, you should add in anamino acid complexto prevent causing an amino acid imbalance in the body. Consult a health care practitioner before use if you have liver or kidney disease or if you have been instructed to follow a low-proteindiet May cause overstimulation Most practitioners agree that ALCAR is safe for most of their patients to take each day however, other potential side effects include mild gastrointestinal symptoms (nausea, vomiting, abdominal cramps, and diarrhea), dry mouth, fishy body odour, flatulence, increased appetite, and headaches

Keep in mind, however, there still are rules for total amount of medicinal and toiletry liquids in checked bags
It's a quality signal, not a value or efficacy claim
Alpha-MSH is a cleavage product of ACTH that has an equal affinity for the MC1 receptor on melanocytes as ACTH