As to NAD+ and the Krebs cycle, Dr. Mercola recommends “It is now beyond obvious to me why no one is promoting niacinamide. This is because it costs less than one cent a day and as a result there is simply no money to be made in promoting it. Ideally you buy niacinamide powder and use 1 to 1/2 of 1/64th of a teaspoon three times a day (25-50 mg).”
https://articles.mercola.com/sites/articles/archive/2023/12/03/nad-plus-optimal-health.aspx
I found some NADH, 20mg. It is labeled Maximum-Strength, Fast-Acting. Instructions are to dissolve one lozenge under the tongue, limit swallowing until it has dissolved completely. There are no instructions about on an empty stomach. This version is called Beta-nicotinamide adenine dinucleotide. Does anyone know if this is a safe level for a healthy 87 year old who does not have bad reactions from all kinds of supplements taken at the recommended amount? The product was from Swanson.
I was glad to see that several here were interested in the details I provided. If you are just starting to have the symptoms, it might be ok and cheaper to take lower doses of the ones I told you I take. If anyone decides to try this or help someone else try it, I hope you will remember my FR name and PM me about progress or results or non results. It was probably 6 months before I saw a noticeable change 3 years ago. The improvements I described have been more or less stable for the past year. Good luck with your health efforts.