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Head-to-head evidence comparison — which supplement is right for you?
NMN vs Spirulina: Spirulina has the stronger overall evidence (7 vs 5.5/10); they're alternatives for metabolic health — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Spirulina wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
8 of 9 studies with measurable effects showed benefit.
Top outcomes
250-500mg
Morning, With or without food
NMN powder or capsules
3-10g daily
With food to mask taste, Morning for energy, Before meals for appetite effects
Powder or tablets
2-4 weeks
2-4 weeks
Long-term
8-12 weeks
4-8 weeks
2-4 weeks
Immediate
Effect of 12-Week Intake of Nicotinamide Mononucleotide on Sleep Quality, Fatigue, and Physical Performance in Older Japanese Adults: A Randomized, Double-Blind Placebo-Controlled Study
Nutrients (2022) · Rct · n=108
Significant interactions were observed between 5-STS and drowsiness. 5-STS of all groups on post-intervention and drowsiness of the NMN_PM and Placebo_PM groups on mid- and post-intervention showed significant improvement compared with those in pre-intervention.
Anti-inflammatory effects of nicotinamide mononucleotide (NMN) in human skeletal muscle after BFR-exercise
Journal of the International Society of Sports Nutrition (2026) · Rct · n=11
Randomised placebo-controlled crossover trial in 11 untrained young men taking NMN 1,200 mg a day for 7 days before blood flow restriction resistance exercise, with muscle biopsies.
The differential impact of three different NAD(+) boosters on circulatory NAD and microbial metabolism in humans
Nature metabolism (2026) · Rct · n=65
Ultimately, we propose a gut-dependent model for the modes of action of the three NAD+ precursors with NR and NMN elevating circulatory NAD+ via the Preiss-Handler pathway, while rapidly absorbed Nam acutely affects NAD+ levels via the salvage pathway.
Systematic Review of the Effects of Plant-Based Foods on Metabolic Outcomes in Adults with MASLD and Comorbidities Such as Obesity, Metabolic Syndrome, and Type 2 Diabetes
Nutrients (2025) · Systematic review
A systematic review of RCTs (2020 to 2025) of plant-based foods in adults with MASLD.
The Role of Chlorella and Spirulina as Adjuvants of Cardiovascular Risk Factor Control: A Systematic Review and Meta-Analysis of Randomised Controlled Trials
Nutrients (2025) · Meta analysis
The analysis found 12 randomised trials of Chlorella and 9 of Spirulina, with 101 to 299 Spirulina participants depending on the outcome.
Edible Algae Reduce Blood Pressure in Humans: A Systematic Review and Meta-Analysis of Randomised Controlled Trials
Journal of human nutrition and dietetics : the official journal of the British Dietetic Association (2025) · Meta analysis · n=1583
Edible algae intake significantly reduced systolic BP (SBP: -2.05 mmHg; 95% CI: -3.80, -0.31; p = 0.022) and diastolic BP (DBP: -1.87 mmHg; 95% CI: -3.10, -0.64; p = 0.001).
The 300, 600 and 900 mg points come from a 60-day dose-ranging trial in 80 healthy middle-aged adults (PMID 36482258): every dose raised blood NAD against placebo, with the highest levels at 600 and 900 mg, and no safety issues up to 900 mg. The 250 mg point is a 12-week placebo-controlled trial in 60 older adults where blood NAD+ rose (PMID 38789831). A pharmaceutical formulation, MIB-626, gave dose-related NAD increases at 1,000 and 2,000 mg a day for 14 days (PMID 35182418) and is not plotted because it is a different formulation. A higher blood NAD level has not been shown to translate into clinical benefit.
AI-estimated from published studies. Interpret as directional guidance.
Spirulina has a higher evidence score (7/10 vs 5.5/10) and wins in 2 of 3 categories.
For metabolic health, NMN has a higher relevance score (80 vs 60).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.