Longevity Protocol Evaluator — Is That Supplement Actually Worth Taking?

Evaluate these longevity supplements I'm considering:
1. NMN (500mg/day)
2. Urolithin A (Mitopure, 500mg/day)
3. Rapamycin (5mg weekly)
4. Fisetin (500mg, 2 days/month)
5. Metformin (500mg/day, non-diabetic)

## Longevity Supplement Evaluation

### 1. NMN (Nicotinamide Mononucleotide) — 500mg/day
Evidence Tier: C+ (moving toward B)

HUMAN EVIDENCE:
- 3 small RCTs (n=30-80) showing NAD+ elevation ✅
- Insulin sensitivity improvement in postmenopausal women
  (n=25, single study) ⚠️
- NO published long-term safety data beyond 12 weeks
- NO hard endpoint data (mortality, disease incidence)

ANIMAL EVIDENCE:
- Strong in mice: improved muscle function, insulin
  sensitivity, vascular health
- Dose translation uncertain (allometric scaling issues)

RED FLAGS:
- NMN market worth $500M+ — enormous commercial pressure
- Most "studies" are company-funded or pre-print
- David Sinclair's promotion creates conflict of interest
  (he holds patents)
- Competitor NR (nicotinamide riboside) has more human data

VERDICT: Promising mechanism, weak human evidence. At $60-
100/month, the cost-benefit ratio is poor until better
RCTs publish. If you take it anyway, 250mg may equal
500mg (saturation curve).

ALTERNATIVE: Niacin ($5/month) raises NAD+ too, with 50
years of safety data. Less sexy, more evidence.

---

### 2. Urolithin A (Mitopure) — 500mg/day
Evidence Tier: B-

HUMAN EVIDENCE:
- Amazentis Phase 2 RCT (n=66): improved muscle endurance
  in elderly after 4 months ✅
- Phase 1 safety: well-tolerated up to 2,000mg ✅
- Mitochondrial function biomarker improvement ✅
- BUT: Amazentis manufactures Mitopure (conflict) ⚠️

KEY INSIGHT — BIOAVAILABILITY TRAP:
Your gut bacteria convert ellagitannins (from pomegranates)
into urolithin A naturally. BUT only ~40% of people have
the right gut bacteria. Supplementing bypasses this.
Worth testing: eat pomegranates for 2 weeks. If you don't
respond (no urolithin A in urine), supplementation makes
more sense.

VERDICT: Better evidence than most. The gut bacteria angle
is genuine science. $50/month is reasonable IF you've
confirmed you're a non-producer.

---

### 3. Rapamycin — 5mg weekly
Evidence Tier: B+ (for mechanism), D for longevity dosing

HUMAN EVIDENCE:
- Approved drug (organ transplant) with decades of safety
  data at HIGH doses ✅
- Mannick et al. (2014, 2018): improved immune function
  in elderly at LOW doses ✅ (but n=264, short-term)
- NO RCTs for longevity-specific dosing in healthy adults
- Dog Aging Project: promising results in companion animals

CRITICAL CONCERN:
- Immunosuppression at transplant doses is well-documented
- Weekly low-dose pulsing is THEORETICAL for longevity
- Zero long-term safety data for the biohacker dosing
  protocol (5mg/week)
- Requires prescription — obtaining it for off-label
  longevity use raises ethical/legal issues

VERDICT: The most mechanistically compelling intervention
on this list (mTOR inhibition is real). But self-
prescribing an immunosuppressant based on mouse data and
one small human trial is HIGH RISK. Tier D for the actual
protocol being used.

---

### 4. Fisetin — 500mg, 2 days/month (senolytic protocol)
Evidence Tier: C

HUMAN EVIDENCE:
- Mayo Clinic trial in diabetic kidney disease: RESULTS
  NOT YET PUBLISHED (started 2018)
- One small pilot (n=14): reduced senescence markers ⚠️
  (tiny sample, no control)
- Bioavailability is extremely poor (<10% absorption)

ANIMAL EVIDENCE:
- Mice: cleared senescent cells, extended healthspan
- BUT: mouse doses translate to impractical human doses
  unless bioavailability is solved

RED FLAGS:
- Senolytic dosing protocol is theoretical (2 days/month
  pulse is borrowed from dasatinib+quercetin research,
  not fisetin-specific)
- The bioavailability problem is real — most of what you
  swallow never reaches tissue
- No standardized product quality (supplement regulation
  is minimal)

VERDICT: Interesting science, premature to supplement.
Wait for the Mayo Clinic trial results. If you want
senolytic flavonoids, eat strawberries (highest natural
fisetin source) — cheaper, tastier, actually proven safe.

---

### 5. Metformin — 500mg/day (non-diabetic)
Evidence Tier: B+ (strongest evidence on this list)

HUMAN EVIDENCE:
- UKPDS trial: reduced all-cause mortality in overweight
  T2DM patients ✅ (landmark study)
- Multiple observational studies: diabetics on metformin
  live LONGER than matched non-diabetics ✅
- TAME trial (Targeting Aging with Metformin): ongoing,
  n=3,000, specifically testing anti-aging ⏳
- 60+ years of safety data, billions of doses taken ✅

CRITICAL NUANCE:
- Observational data in DIABETICS may not transfer to
  healthy adults (healthy user bias)
- May blunt exercise adaptation (muscle protein synthesis
  reduction shown in 2 studies) ⚠️
- Mild GI side effects common (10-25%)
- TAME trial results will be definitive — expected 2026-2027

VERDICT: Most evidence-backed intervention on this list.
$4/month generic. Well-understood safety profile. The
exercise blunting concern is real but manageable (don't
take it on training days). Reasonable to discuss with
your doctor. Wait for TAME trial for definitive answer.

---

## STACK RECOMMENDATION

| Supplement | Take? | Confidence | Monthly Cost |
|---|---|---|---|
| NMN | Skip for now | Low | $60-100 |
| Urolithin A | Maybe (test gut bacteria first) | Medium | $50 |
| Rapamycin | No (too risky without medical supervision) | Low | $30 + Rx |
| Fisetin | Skip (wait for Mayo data) | Low | $20 |
| Metformin | Discuss with doctor | Medium-High | $4 |

TOTAL SAVED: $130-200/month by dropping low-evidence
supplements.

WHAT TO DO INSTEAD WITH THAT MONEY:
- Gym membership ($50) — resistance training has Tier A
  evidence for longevity
- Better sleep setup ($50) — blackout curtains, cooling
  — sleep is the #1 longevity lever
- High-quality food ($100) — Mediterranean diet has more
  RCT evidence than all supplements combined

skills:
  - longevity-assistant
  - pubmed           # For pulling primary sources
  - medical-research-toolkit  # For cross-referencing