NR (Nicotinamide Riboside) was the first NAD+ precursor to gain mainstream attention. Here’s your complete guide to NR supplementation.
What is NR?
NR (Nicotinamide Riboside) is a form of vitamin B3 that your body converts to NAD+. It was discovered in 2004 by Dr. Charles Brenner and has been extensively studied since.
The conversion pathway: NR → NMN → NAD+
NR is two steps away from NAD+, compared to NMN’s one step. However, NR has more human clinical data than any other NAD+ precursor.
How NR Works
- NR enters cells — Easily absorbed through the gut
- NRK enzyme converts NR to NMN — Using the enzyme nicotinamide riboside kinase
- NMN is converted to NAD+ — Through the NMNAT enzyme
- NAD+ levels rise — Supporting cellular energy and repair
Clinical Evidence
NR has the strongest clinical evidence of any NAD+ precursor:
Key Human Studies
2016 (Nature Communications):
- First human NR study
- 1000mg/day for 7 days
- NAD+ levels increased by 60%
- Safe and well-tolerated
2017 (American Journal of Clinical Nutrition):
- 2000mg/day for 12 weeks
- Significant NAD+ increase
- No adverse effects
2018 (Scientific Reports):
- 1000mg/day for 8 weeks
- Improved blood pressure in pre-hypertensive adults
- Reduced aortic stiffness
Multiple Tru Niagen studies:
- 30+ human clinical trials
- Consistent safety and efficacy data
- FDA GRAS status
Benefits of NR
Well-Established
- Raises NAD+ levels — Consistently shown in human studies
- Safe and well-tolerated — No serious adverse effects in any trial
- Improves blood pressure — Multiple studies show modest BP reduction
- Supports metabolic health — May improve insulin sensitivity
Promising
- Neuroprotection — May support brain health
- Cardiovascular support — Improved arterial function
- Exercise performance — Some studies show improved muscle recovery
- Liver health — May support liver function
Dosage Guide
| Goal | Daily Dose | Timing |
|---|---|---|
| General wellness | 250-300mg | Morning |
| Anti-aging | 300-600mg | Morning |
| Therapeutic | 600-1000mg | Split AM/PM |
| Maximum studied | 2000mg | Split AM/PM |
Best NR Products
Best Overall: Tru Niagen
- Patented NR (Niagen)
- 30+ human clinical studies
- FDA GRAS status
- $47.95/90 capsules (300mg)
Best Value: Thorne NiaCel
- Contains NR + TMG
- Good quality
- $35-50/month
Best Budget: HPN Niagen
- Third-party tested
- Lower price point
- $25-40/month
NR vs NMN
| Factor | NR | NMN |
|---|---|---|
| Clinical trials | 30+ | 20+ |
| FDA status | GRAS | Not GRAS |
| Price | $25-60/month | $30-80/month |
| Stability | More stable | Less stable |
| Conversion steps | 2 | 1 |
| Bioavailability | Good | Good |
Bottom line: Both are effective. NR has more clinical evidence and FDA approval. NMN has a more direct conversion pathway. Choose based on your priorities.
Side Effects
NR has an excellent safety profile:
- No serious adverse effects in any clinical trial
- Mild nausea possible at high doses
- May cause flushing (similar to niacin)
- Generally very well-tolerated