Longevindex
LMNT Electrolytes

Equipment Reference

LMNT

LMNT Electrolytes

Sugar-free sodium-potassium-magnesium for fasting, keto, and training

4.7
(12,400 community reviews)

LMNT is the biohacking community's default electrolyte drink: 1000mg sodium, 200mg potassium, 60mg magnesium per packet with zero sugar. Created by Robb Wolf, it's essential for intermittent fasting, keto, sauna sessions, and Zone 2 training where sweat losses demand aggressive sodium replacement.

Health Disclaimer

This content is for general informational and educational purposes only. It is not medical advice, diagnosis, or treatment. Consult a qualified healthcare provider before starting any supplement, peptide, or health protocol. Read our full health disclaimer.

Used by
Robb WolfDave Asprey communityKeto/fasting practitionersSauna and endurance athletes

Typical price: $45 USD / 30 packets

Official store ships primarily to the US; Amazon availability varies by region.

Read the full guide first
NAD+ & Longevity: The Complete GuideCreatine: The Complete Guide

As an Amazon Associate, Reo Tuku Iho Limited earns from qualifying purchases through Amazon links on this site. Full disclosure

For educational purposes only. Not medical advice. Read our health disclaimer.

How It Works

Low-carb diets, fasting, and heavy sweating deplete sodium faster than standard dietary intake replaces. The 'keto flu,' fasting headaches, and post-sauna fatigue are primarily sodium deficiency — not magic. LMNT delivers therapeutic sodium doses (1000mg) that Gatorade (140mg) and most electrolyte products can't match without sugar.

1

Sodium Replacement

1000mg sodium per packet replaces losses from fasting, sweating, and low-carb diets.

2

Zero Sugar

No glucose — won't break a fast or spike blood sugar on a CGM.

3

Full Spectrum

Sodium, potassium, and magnesium in ratios optimized for biohackers, not mainstream sports drinks.

What You'll Experience

First Use

Day 1

Noticeable energy and headache relief within 30 minutes if sodium-depleted.

Fasting/Keto

Week 1

Eliminates keto flu symptoms. Sustains energy through 16–20 hour fasts.

Training/Sauna

Ongoing

One packet pre-sauna or post-workout prevents cramping and fatigue.

Benefits

Fasting Support

Moderate Evidence

Prevents headaches and fatigue during intermittent fasting and extended fasts.

Sodium Replacement

Strong Evidence

1000mg sodium — 7× a Gatorade — for sauna, training, and keto losses.

CGM-Friendly

Strong Evidence

Zero sugar means zero glucose impact on continuous glucose monitors.

Risks & Considerations

Blood Pressure

medium risk

1000mg sodium per packet. Caution if hypertensive or on sodium restriction.

Kidney Disease

high risk

High sodium/potassium loads are dangerous with impaired kidney function.

Community Reviews

Synthesized consensus from Reddit, forums, and expert sources.

Reddit r/Biohackers
Mostly Positive

LMNT is the default electrolyte recommendation. 'One packet before sauna, one after cold plunge — no more post-session headaches.'

  • ·Essential for fasting and keto
  • ·Sauna/cold plunge electrolyte standard
  • ·Zero sugar — CGM friendly
View source

Learn More: Full Guides

NAD+ & Longevity: The Complete Guide
Supplements
15 min readDeep dive

NAD+ & Longevity: The Complete Guide

NAD+ is one of the most critical molecules in human biology, essential for energy, DNA repair, and activating longevity pathways. Levels decline ~50% between ages 40–60. This guide explains what NAD+ does, whether supplementation works, NR vs NMN debate, and how to test your levels.

Read guide
Creatine: The Complete Guide
Supplements
12 min readDeep dive

Creatine: The Complete Guide

Creatine monohydrate is one of the few supplements with decades of human research, not just for muscle and strength, but increasingly for brain energy, recovery, and healthy aging. This guide covers dosing, loading, what form to buy, and who actually benefits.

Read guide

Last updated: 2026-07-11 · Informational only. Not medical advice. Health disclaimer.