Condition deep-dive · 6 min read

Silent Reflux (LPR) — supplement protocol

Updated 2026-05-19 · Reviewed by SupplementScore editors · No sponsorships

Laryngopharyngeal reflux (LPR) — "silent reflux" — is reflux that reaches the larynx and pharynx, causing chronic throat clearing, hoarseness, postnasal-drip sensation, and chronic cough, often without classic heartburn. Pepsin (gastric enzyme refluxed with the gastric contents) appears central to laryngeal mucosal damage and persists in tissue even after acid is neutralised. PPIs help fewer LPR patients than they help GERD patients — the response rate is around 50% even in well-selected cases. Alginate-based barrier therapy has rising evidence and is the supplement-aisle move with the best signal in LPR specifically.

Get an ENT or GI assessment. Persistent hoarseness over 4–6 weeks, particularly in smokers, drinkers, or those with weight loss, warrants ENT laryngoscopy to exclude laryngeal cancer. Reflux-symptom mimics include eosinophilic oesophagitis (requires endoscopy + biopsy), post-nasal drip from sinus disease, vocal-cord dysfunction, and Zenker's diverticulum. The protocol below assumes a clinical LPR diagnosis after appropriate workup.

The supplement stack — barrier and pepsin neutralisation

Layer 1 · Strongest LPR-specific evidence

Alginate-based barrier therapy (Gaviscon Advance or equivalent)

10 mL after each meal and at bedtime (4 doses/day) for 8–12 weeks

Sodium alginate + potassium bicarbonate forms a floating gel raft on top of gastric contents, physically inhibiting reflux of acid AND pepsin (which PPIs don't address). The McGlashan 2009 LPR trial and several subsequent studies show alginate non-inferior to PPI for LPR symptoms, with the alginate group having greater early symptom improvement. Strachan 2012 specifically demonstrated pepsin neutralisation. Different from US-formulation Gaviscon, which has lower alginate content — choose Gaviscon Advance / Reflux Advance (UK formulation) or specific alginate-rich brands.

Layer 2 · Mucosal protection

Deglycyrrhizinated liquorice (DGL)

380–760 mg chewed before meals; not the whole-licorice form

DGL has long-standing use as a mucosal protective agent in peptic ulcer disease and reflux. Trial weight in LPR specifically is modest, but mechanism is sound (stimulation of mucin secretion and mucosal-barrier strengthening). Use only DGL — not whole liquorice, which contains glycyrrhizin and causes pseudohyperaldosteronism (hypertension, hypokalaemia) with chronic use.

Layer 2 · For nocturnal LPR specifically

Melatonin (3 mg) — bedtime

3 mg taken 30 min before bedtime

Pereira 2006 Iranian trial showed melatonin 3 mg/night for 40 nights improved reflux symptoms vs omeprazole and combination groups. The mechanism is incompletely understood — possibly LES tone improvement and antioxidant effect on oesophageal mucosa. Useful when LPR is nocturnal-dominant (waking with throat irritation, dry/sore throat in morning).

Layer 3 · Mucilage / demulcent layer

Slippery elm or marshmallow root (demulcents)

Slippery elm 400–500 mg or marshmallow root 6 g/day in tea or capsule before meals

Mucilage-containing herbs coat irritated mucosa with a protective gel-like layer. Trial evidence is modest but the mechanism is plausible and tolerability excellent. Tea form is often preferred. Modest adjunct value.

Optional · For functional component

Probiotic with mixed Lactobacillus / Bifidobacterium strains

Per product directions; 4–8 week trial

Probiotic effects on reflux are modest and inconsistent in trials. May help when symptoms have a functional/dysbiotic component (postprandial bloating, irregular bowel habit alongside reflux). Not a primary LPR therapy.

The lifestyle layer (often dominant)

Weight reduction — when relevant; reduces intra-abdominal pressure and reflux burden.
Head-of-bed elevation 6–8 inches — physical reduction of nocturnal reflux; more effective than extra pillows.
Trigger food/drink reduction — late evening meals, alcohol (particularly after 6pm), carbonated drinks, peppermint, chocolate, citrus, tomato are common LPR triggers though individual variation is wide. A 2-week elimination + reintroduction often clarifies personal triggers.
3-hour pre-bed eating cutoff — particularly potent in LPR; allows gastric emptying before recumbency.
Tobacco and alcohol minimisation — both worsen LPR through LES effects.
Voice care — chronic throat clearing perpetuates the symptom; speech-language pathology referral for voice rehabilitation in stubborn cases.
Loose clothing — tight waistbands increase reflux burden.

The medical layer

PPIs (omeprazole, esomeprazole, pantoprazole) help approximately 50% of LPR patients but the response is slower and less reliable than in classic GERD — 8–12 weeks of twice-daily PPI is often needed to judge effect. The 2023 Wei meta-analysis questioned routine PPI use in non-erosive LPR. H2 blockers (famotidine) at bedtime can address nocturnal acid breakthrough. For confirmed LPR refractory to medical therapy, prokinetics or anti-reflux surgery (fundoplication, Linx device) may be considered — gastroenterology / surgery territory.

What to skip

Apple cider vinegar (oral) for reflux — the "low stomach acid causes reflux" theory is incorrect for most patients; ACV can worsen LPR mucosal irritation.
Whole liquorice supplements — pseudohyperaldosteronism risk (hypertension, hypokalaemia) with chronic use.
Betaine HCl supplementation — increases gastric acid in normal subjects; not appropriate for reflux.
Peppermint tea — relaxes LES; worsens reflux despite GI-symptom marketing.
Long-term PPIs without an exit strategy — appropriate in many cases but routine indefinite use should be reassessed periodically (osteoporosis, renal, infection considerations).

Practical quick-start. ENT laryngoscopy if persistent hoarseness or risk factors for laryngeal cancer. Head-of-bed elevation, 3-hour pre-bed eating cutoff, alcohol minimisation, trigger food elimination trial. Alginate barrier (Gaviscon Advance or equivalent) after each meal and bedtime × 8 weeks. DGL before meals if mucosal irritation dominant. Melatonin 3 mg at bedtime if nocturnal LPR. Reassess at 8 weeks; if persistent, formal pH-impedance testing and/or PPI trial through GI/ENT.

Educational reference, not medical advice. Discuss any supplement change with a qualified clinician before acting on this list. Persistent hoarseness or LPR symptoms warrant formal ENT/GI evaluation.