Stack Reviews — Honest Supplement & Peptide Reviews

Supplement Reviews

Longevity Supplements Ranked

Each review includes source testing, bioavailability data, and value-per-dose analysis.

NMN

Best NMN Supplements (2026)

We tested 8 NMN brands for purity, stability, and actual NMN content via third-party HPLC. Several "1000mg" products contained less than 600mg of actual NMN. Three stood out.

92

8 brands tested HPLC verified Updated Sep 2026

Omega-3

Fish Oil Showdown: Triglyceride vs. Ethyl Ester

Triglyceride-form omega-3 absorbs 70% better than ethyl ester — but costs more. We tested 6 brands across both forms and measured omega-3 index changes over 90 days.

88

6 brands tested 90-day protocol Updated Aug 2026

Magnesium

Magnesium Forms Compared

Glycinate, threonate, taurate, citrate — there are 11 supplemental forms. We break down which form is optimal for sleep, cognition, muscle recovery, and gut motility based on absorption data and clinical use.

85

11 forms analyzed Clinical data Updated Jul 2026

CoQ10

Ubiquinol vs. Ubiquinone: Worth the Price?

Ubiquinol costs 2–3x more than ubiquinone. Is the pre-reduced form worth it? We analyzed absorption studies, tested 4 products, and measured plasma CoQ10 levels at 30 and 60 days.

82

4 brands tested 60-day protocol Updated Jun 2026

Wearable Reviews

Biohacking Wearables Ranked

The devices that actually move the needle on longevity tracking — and the ones that are expensive novelties.

Sleep & HRV

Oura Ring Gen 4 vs. WHOOP 5.0

Two of the most popular recovery trackers go head-to-head. We wore both for 60 days and compared sleep staging accuracy, HRV consistency, and actionability of insights. One is clearly better for longevity tracking.

90

60-day comparison Side-by-side data

CGM

Continuous Glucose Monitors for Non-Diabetics

Levels, Nutrisense, and Stelo compared. A CGM reveals your personal glucose response to food — but is it worth $200+/month if you're metabolically healthy? We tested all three and measured actionable insights per dollar.

78

3 platforms tested 30-day each

Body Comp

At-Home Body Composition: DEXA Alternatives

Withings Body Scan, InBody H20N, and RenphoAI Smart Scale compared against a clinical DEXA scan baseline. We measured visceral fat, lean mass, and bone density accuracy over 90 days.

74

3 devices tested DEXA validated

How We Review

Our Review Methodology

Testing Protocol

Every supplement review follows the same 90-day protocol: baseline bloodwork, standardized dosing, controlled variables, and post-protocol bloodwork. We use third-party HPLC testing for purity verification on all supplement reviews.

Scoring System

Our 0–100 score weighs five factors: evidence quality (30%), purity/testing (25%), bioavailability (20%), value per dose (15%), and transparency (10%). Scores below 60 don't get published — we focus on what's worth your money, not what to avoid.

Independence

We buy every product at retail price. We don't accept free samples, sponsored reviews, or affiliate-driven rankings. Revenue comes from our newsletter and educational content — never from the products we review.

Honest Reviews. Real Data.