LMNT scored 70/100 in our review, the highest in our electrolyte coverage, and it’s a clean, fully disclosed product. “Side effects” here isn’t about hidden ingredients — it’s about whether its deliberately large sodium dose is right for you.

The sodium question is the whole question

Each LMNT stick delivers 1,000 mg of sodium — the highest in the major electrolyte category, and a deliberate design choice for athletes, heavy sweaters and people on low-carb or fasting protocols who lose and need more sodium. For that person, it’s a feature, and side effects are minimal (occasional nausea if taken without enough water, or a too-salty taste some dilute).

For a different person, that same gram is a caution:

01High blood pressure. If you’re managing hypertension or are sodium-sensitive, 1,000 mg in one drink is a meaningful share of a day’s budget. Talk with your doctor before making it a daily habit.
02Kidney or heart conditions. Anyone with kidney disease or heart failure should treat added sodium at this level as a medical decision, not a wellness one.
03Everyday desk use. If you’re not sweating hard, you may simply be taking on more sodium than you need. A lower-sodium option may fit better — see the alternatives below.

One item on the record

In April 2021, before LMNT’s current certification, a California Proposition 65 60-day notice (AG No. 2021-00819) named two LMNT flavors for lead. Prop 65 thresholds sit far below federal limits and a notice is not a finding of harm; LMNT’s later third-party testing is the strongest answer to it, and we note it for completeness rather than alarm. Details are in our full review.

Frequently asked questions

What are the side effects of LMNT?

For most users, minimal — occasional nausea if taken without enough water, or an overly salty taste. The real consideration is the 1,000 mg sodium dose relative to your needs.

Is 1,000 mg of sodium too much?

It depends on you. It’s ideal for hard sweaters and low-carb/fasting protocols; it’s a caution if you have high blood pressure, kidney or heart conditions, or don’t sweat much. Ask your doctor if any of those apply.

Has LMNT had a lead issue?

A 2021 California Prop 65 notice named two flavors for lead. Prop 65 limits are far below federal thresholds and a notice isn’t a finding of harm; LMNT’s later third-party testing is the strongest answer.

Is there a lower-sodium alternative?

Earth Energy Daily Hydration delivers 750 mg; Nuun Sport 300 mg. See the alternatives below and the full comparison.

Sources

  1. LMNT — drinklmnt.com ingredients and label (Na 1,000 mg, K 200, Mg 60, 0 g sugar). Checked July 17, 2026.
  2. California Attorney General — Prop 65 60-day notice AG No. 2021-00819 (lead; LMNT flavors; April 2021). oag.ca.gov
  3. The Ingredient Report — LMNT review (70/100) and electrolyte comparison.

Update history

Content is for informational purposes only and is not medical advice. Medical disclaimer.