These are not the same thing, and I can help break this down to help you
The following list is not exhaustive, but summarizes the main families of molecules which can cross or not the BBB

Key Functions Cellular and Metabolic Functions Supports mitochondrial function and energy production Necessary for DNA synthesis and repair Involved in enzyme activation and metabolic processes Neurological and Brain Health Crosses the blood-brain barrier to remove neurotoxins (e.g., mercury) Helps protect neurons by reducing oxidative stress in the brain May increase acetylcholine , supporting memory and cognition May protect against neurodegenerative conditions like Alzheimer's and Parkinsons Antioxidant and Detoxification Acts as a master antioxidant , neutralizing free radicals Helps maintain healthy skin and complexion Helps reduce oxidative stress , a contributor to aging and chronic disease Aids in detoxification of environmental and internal toxins Supports liver function , including alcohol metabolism Immune and Inflammatory Support Enhances T-cell function , supporting immune response Plays a role in inflammation control Supports tissue repair , healing, and regeneration Supports healthy gut lining and digestive health What is Liposomal Delivery

J Clin Lab analysis
MOTS-C A mitochondrial-derived peptide studied for metabolic regulation, insulin sensitivity, and healthy aging
In these studies, high-dose niacin treatment restored NAD + levels and provided functional benefits in adult patients: remarkable decrease of liver fat, increase of mitochondrial respiration and biogenesis, muscle strength and exercise tolerance 15