Mineral

Chloride

Chloride (Cl⁻)

Evidence TierAWADA NOT PROHIBITED

tuneTypical Dose

1,500-2,300 mg per day (typically from salt)

watchEffect Window

Acute correction within hours once chloride and fluid deficits are addressed.

check_circleCompliance

WADA NOT PROHIBITED

Overview

Clinical Summary

Chloride is an essential electrolyte and a component of gastric hydrochloric acid. It is used to support fluid balance and digestion, particularly when losses occur through heavy sweating or illness.

Adequate chloride supports hydration status, acid-base balance, and stomach acid production for digestion. Replacing losses can improve symptoms of dehydration and help normalize electrolyte balance in specific scenarios. Minority clinical use includes correcting metabolic alkalosis under supervision. For most diets, chloride needs are met through salt and common foods.

Most abundant extracellular anion. Works with sodium to maintain osmotic pressure, blood volume, and acid-base balance. Critical component of gastric HCl.

Outcomes

What This Is Expected To Influence

Primary Outcomes

Extracellular fluid homeostasis
Acid-base balance

Secondary Outcomes

Gastric acid production (HCl)

Safety

Contraindications and Interactions

Contraindications

Severe kidney disease
Unmanaged hypertension

Side effects

Elevated blood pressure at high intake (via sodium chloride)
Hyperchloremia with excessive supplementation

Interactions

Loop and thiazide diuretics alter chloride losses
Sodium and potassium intake interact with chloride balance

Avoid if

Salt-sensitive hypertension

Evidence

Study-level References

chloride-SRC-001Review

Sourceopen_in_new

Berend K, van Hulsteijn LH, Gans RO. Chloride: the queen of electrolytes? Eur J Intern Med. 2012;23(3):203-211. doi:10.1016/j.ejim.2011.11.013. PMID:22385875.

Population: General clinical population

Dose protocol: Narrative review of chloride metabolism, transport, and clinical measurement across body fluid compartments

Key findings: Chloride is the most abundant anion in serum and plays a key role in fluid regulation, electrical neutrality, and acid-base status. Abnormal chloride levels signal serious underlying metabolic disorders such as metabolic acidosis or alkalosis.

Notes: Evidence strongly supports essential physiologic role and deficiency correction. Performance/nootropic effects beyond repletion are not established.

Paper content

This review discusses the critical role of chloride as the second most abundant electrolyte in serum, essential for regulation of body fluids, electrolyte balance, electrical neutrality, and acid-base status. The authors highlight that chloride is often overlooked in clinical assessment and discuss chloride channelopathies and their genetic basis.

chloride-SRC-002Systematic review and meta-analysis

Sourceopen_in_new

Wan X, Deng F, Bai X, et al. Dysregulated serum chloride and clinical outcomes in critically ill adults: A systematic review and meta-analysis. PLoS One. 2025;20(12). doi:10.1371/journal.pone.0337560. PMID:41325394.

Population: Critically ill adult ICU patients from 34 studies

Dose protocol: Systematic review and meta-analysis of 34 studies (n=175,021) examining hypochloremia and hyperchloremia prevalence and associations with mortality and acute kidney injury in critically ill adults

Key findings: Both hyperchloremia (OR 1.28, 95% CI 1.08-1.52) and hypochloremia (OR 1.55, 95% CI 1.33-1.81) were independently associated with increased mortality. Hyperchloremia was also linked to increased risk of acute kidney injury (OR 1.40, 95% CI 1.07-1.85). A dose-response analysis confirmed a non-linear relationship between serum chloride levels and mortality risk at both extremes.

Notes: First large-scale meta-analysis quantifying the independent prognostic significance of dyschloremia in critical care. Reinforces the clinical importance of chloride monitoring beyond sodium alone.