Vitamin B3 (Niacin) - NAD+, NADH, NADPH, Nicotinic Acid - Diet & Nutrition - Biochemistry
The provided transcript is largely incoherent and appears to be a nonsensical jumble of words and phrases, making a meaningful summary extremely difficult. It mentions Vitamin B3 (niacin), NAD+, NADH, NADPH, and nicotinic acid, but the connection between these elements and the rest of the transcript is almost entirely absent. There is no discernible structure or logical flow of information. The inclusion of seemingly random words and phrases in English and Vietnamese further complicates any attempt at comprehension.
Therefore, providing a summary in the requested format is impossible. The transcript needs significant correction and restructuring before a coherent summary can be produced. It's likely the transcript is flawed, possibly due to transcription errors or a malfunctioning speech-to-text system.