Berberine vs NR (Nicotinamide Riboside)

Mechanism

Berberine activates AMP-activated protein kinase (AMPK), the master metabolic sensor, mimicking many effects of caloric restriction and exercise. It inhibits mitochondrial Complex I, increasing the AMP:ATP ratio which triggers AMPK. Downstream effects include enhanced GLUT4 translocation (glucose uptake), inhibition of HMG-CoA reductase (cholesterol synthesis), upregulation of LDL receptor expression, and suppression of PCSK9. It also modulates gut microbiome composition, increasing short-chain fatty acid-producing bacteria.

Standard Dosing

500mg 2-3x daily (1000-1500mg total)

Timing

With meals or immediately before meals (reduces postprandial glucose spike). Must be taken with food.

Cycle Duration

Cycle 8-12 weeks on, 4 weeks off (or continuous under practitioner supervision)

Side Effects

• GI cramping/diarrhea (dose-dependent)
• Constipation in some
• Abdominal distension
• Potential for hypoglycemia

Contraindications

• Pregnancy (uterotonic — may induce contractions)
• Lactation
• Concurrent use of multiple CYP3A4 metabolized drugs
• Severe liver disease
• Children under 12

Best Stacking Partners

Mechanism

NR is converted to NMN by nicotinamide riboside kinases (NRK1/NRK2), then to NAD+ via the salvage pathway. Like NMN, elevated NAD+ activates sirtuins, PARPs, and CD38. NR has demonstrated ability to cross the blood-brain barrier and elevate brain NAD+ levels. It supports mitochondrial function, DNA repair, and circadian rhythm regulation through SIRT1-mediated deacetylation of BMAL1 and CLOCK proteins.

Standard Dosing

300-600mg daily

Timing

Morning with or without food.

Cycle Duration

ongoing

Side Effects

• Mild nausea
• Warmth/flushing (mild)
• GI upset
• Fatigue in some during initial days

Contraindications

• Active cancer (same theoretical NAD+ concern as NMN)
• Pregnancy/lactation
• Theoretical cancer concern shared with NMN

Best Stacking Partners