Lesser-Known NAD+-Boosting Supplements: Tryptophan, NADH, NMNH, and NRH

What are the pros, cons, and efficacy of dihydronicotinamide riboside (reduced NR), perhaps the most potent NAD+ precursor, as well as reduced NMN, taking NAD+ directly, or making it from scratch from tryptophan?

This is the seventh video in my NAD+ series. If you missed any of the previous ones, check out:
• Do NAD+ Levels Decline with Age? ( )
• Can NAD+ Boosters Increase Lifespan and Healthspan? ( )
• Risks and Benefits of Nicotinic Acid (NA), a NAD+ Booster ( )
• Risks and Benefits of Nicotinamide (NAM), a NAD+ Booster ( )
• Risks and Benefits of Nicotinamide Riboside (NR), a NAD+ Booster ( )
• Risks and Benefits of Nicotinamide Mononucleotide (NMN), a NAD+ Booster ( )

Stay tuned for:
• Risks of NAD+ Boosting Supplements ( )
• Which NAD+ Booster Is Best? ( )
• The Third Way to Boost NAD+ ( )

For more on aging, go to your local public library and check out my longevity book, How Not to Age ( ), available in print, e-book, and audio. (All proceeds I receive from the book are donated directly to charity.)

New subscribers to our e-newsletter always receive a free gift. Get yours here: .

Have a question about this video? Leave it in the comment section at and someone on the NutritionFacts.org team will try to answer it.

Want to get a list of links to all the scientific sources used in this video? Click on Sources Cited at . You’ll also find a transcript and acknowledgements for the video, my blog and speaking tour schedule, and an easy way to search (by translated language even) through our videos spanning more than 2,000 health topics.

Thanks for watching. I hope you’ll join in the evidence-based nutrition revolution!
-Michael Greger, MD FACLM

Captions for this video are available in several languages; you can find yours in the video settings. View important information about our translated resources:

• Subscribe:
• Donate:
• Podcast :
• Books:
• Shop:
• Facebook:
• Twitter:
• Instagram: