Link to original video by Medicosis Perfectionalis

Vitamin B3 (Niacin) - NAD+, NADH, NADPH, Nicotinic Acid - Diet & Nutrition - Biochemistry

The provided transcript is largely incoherent and appears to be a random collection of words and phrases, making a meaningful summary extremely difficult. There is no discernible structure or logical flow of information related to Vitamin B3 (Niacin), NAD+, NADH, NADPH, Nicotinic Acid, diet, nutrition, or biochemistry. The text includes numerous seemingly unrelated words and phrases in English and Vietnamese, brand names, and even what sounds like snippets of conversations.

Therefore, it's impossible to provide a meaningful summary in Vietnamese or any other language using the given structure. To create a summary, a coherent and organized transcript focusing on the intended topic is needed.