I'm not personally aware of anything that would directly point to B12 supplementation raising iron levels
Biotin (2500 mcg) Strengthens skin, hair, and nails
In a controlled clinical trial, 70% of women showed improved skin collagen after thigh treatment compared to 50% with vitamin C and 40% with retinoic acid
Documented symptomatic hypoglycemia (glucose of 70 mg/dL or less) was reported in 16.7% to 29.8% of patients receiving semaglutide, and severe or blood glucose confirmed symptomatic hypoglycemia (glucose of 56 mg/dL or less) was reported in 8.3% to 10.7% of patients receiving semaglutide
One particular study showed that tumor-bearing mice treated with 10 mg/kg of melatonin and 5 mg/kg of cisplatin, melatonin reduced DNA damage, and also enhanced the anticancer effects of cisplatin [220]
doi: 10.1523/JNEUROSCI.3885-07.2007