Another (very small study) found that combining biotin with a probiotic supplement, alongside a targeted topical gel appeared to safely reduce acne and improve skin health over 2 months in people with mild to moderate acne
It is presumed that vitamin B supplements may have contributed to obesity development levels
[7] In practice, some protocols use 1 mg IM monthly for maintenance once levels are stabilized

References Nature Medicine (2014) Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity PMC (2024) Nicotinamide N-methyltransferase inhibition mitigates obesity-related metabolic dysfunctions Frontiers in Pharmacology (2024) NNMT: a novel therapeutic target for metabolic syndrome PubMed (2021) LC-MS/MS assay for 5-amino-1-methylquinolinium: pharmacokinetic and oral bioavailability study ResearchGate (2021) Combined NNMT inhibition and reduced-calorie diet normalizes body composition in obese mice PMC (2022) Reduced calorie diet combined with NNMT inhibition establishes a distinct microbiome in DIO mice NMN.com / Scientific Reports Role of NNMT inhibition in muscle strength: enhanced grip strength with exercise Swolverine 5-Amino-1MQ mechanism, benefits, stacking and cycling guide PMC Subcutaneous drug injection review: pharmacologic considerations CDC Vaccine administration: subcutaneous route (angle/site

For details, see the updated B Vitamin Supplements Review
Integral for healthy nervous system: Vitamin B12 Injection For Dogs Is Essential For Healthy Nervous System-Picture Courtesy: Bella + Duke Vitamin b12 injection supports good health of nervous system