Zinc Bisglycinate 30mg Cuts Tinnitus Severity -28%, Recovers Hearing +15% in 12-Week RCT
WELLNESS

Zinc Bisglycinate 30mg Cuts Tinnitus Severity -28%, Recovers Hearing +15% in 12-Week RCT

By Sophie · · Audiology and Neurotology 2025
KO | EN

Zinc bisglycinate 30mg/day for 12 weeks reduced tinnitus severity (THI) -28%, recovered hearing threshold (PTA) +15%, raised cochlear SOD (superoxide dismutase) +25%, lowered NMDA excitotoxicity -22%, depression·anxiety (BDI·BAI) -25% in 150 zinc-deficient (serum zinc <70μg/dL) chronic tinnitus 50+ patients, according to 2025 Audiology and Neurotology (Karger) data. First RCT validation for the missed 20~30% zinc-deficient population.

The trial enrolled chronic tinnitus + zinc deficiency 50+ patients totaling 150, across 12 weeks. Results: tinnitus severity -28%, hearing threshold +15% recovery (especially high frequency), cochlear SOD +25%, NMDA excitotoxicity -22%, depression·anxiety -25%, immune marker support. Adverse events: minor (mild gastric 5%, transient nausea at 30mg+).

Zinc — auditory cell’s forgotten mineral

Why zinc is core for hearing:

  • Cochlear hair cells contain very high concentration (second only to liver)
  • Antioxidant enzyme (SOD·GPx) cofactor
  • NMDA receptor regulation (excitotoxicity block)
  • Mitochondrial protection
  • Immune·neural support

Zinc deficiency — common missed:

  • 20~30% of Korean population deficient (especially 50+·vegetarians·chronic GI)
  • Dietary insufficiency + absorption failure (phytates·chronic gastritis·PPIs)
  • Serum zinc <70μg/dL deficient, 70~120 normal

Symptoms:

  • Hearing: tinnitus·hearing decline·noise sensitivity
  • Taste·smell: reduced (specific signal)
  • Immunity: cold·wound healing ↓
  • Skin: acne·dermatitis
  • Cognition: depression·anxiety

Why bisglycinate:

  • Zinc + glycine binding → absorption superior
  • Gastric burden ↓ (vs oxide·zinc sulfate)
  • Auditory cell delivery ↑

Multi-target mechanisms:

1. Cochlear SOD +25%:

  • Superoxide dismutase cofactor
  • Oxidative stress ↓
  • Hair cell protection

2. Tinnitus severity -28%:

  • Zinc deficiency → cochlear·neural failure → tinnitus
  • Supplementation → normalization
  • Chronic tinnitus support

3. Hearing threshold +15% recovery:

  • High-frequency (consonants·“S”·“T”) priority
  • Hair cell function support
  • Zinc-deficient patient core target

4. NMDA excitotoxicity -22%:

  • Zinc is natural NMDA receptor regulator
  • Glutamate excitotoxicity ↓
  • Hair cell death block

5. Depression·anxiety -25%:

  • Zinc-deficient patients commonly co-occur with depression
  • Neural support → mood stability
  • Chronic tinnitus-depression bidirectional risk block

Clinical data

  • Audiology and Neurotology 2025 RCT 150 patients 12 weeks: THI -28%, PTA +15%
  • 2024 meta-analysis: 10 zinc tinnitus trials consistent efficacy (deficient patients superior)
  • 2023 trial: presbycusis 80 patients 12 weeks adjunct
  • 2022 trial: elderly taste dysfunction + tinnitus 60 patients 12 weeks matrix
  • 2024 trial: zinc + magnesium + ginkgo matrix +20% superior to single

Korean market context

Supplements:

  • Zinc bisglycinate 15mg 60 caps: 10,000~25,000 KRW
  • Zinc bisglycinate 30mg 60 caps: 15,000~35,000 KRW
  • Matrix (zinc + copper 8:1 + magnesium) 60 caps: 30,000~60,000 KRW
  • Matrix (zinc + ginkgo + CoQ10) 60 caps: 50,000~100,000 KRW

Use:

  • Hearing·tinnitus: bisglycinate 30mg/day (8~12 week assessment)
  • General supplementation: 15mg/day
  • Between meals or with meals
  • 30mg+ chronic use copper deficiency risk → 8:1 matrix recommended

Diet — natural zinc:

  • Oysters (richest, 1 oyster 5~10mg)
  • Beef·pork·chicken
  • Pumpkin seeds·sunflower seeds·cashews
  • Whole grains·lentils·chickpeas
  • Oysters + Korean traditional matrix natural assets

Testing:

  • Serum zinc: 70~120μg/dL normal
  • RBC zinc: more accurate (chronic deficiency)
  • Taste·smell testing (indirect markers)

Cautions

  • 30mg+ chronic use: copper deficiency risk (8:1 matrix recommended — zinc 30mg + copper 4mg)
  • Antibiotics (tetracycline·quinolone) concurrent: absorption block, 2-hour separation
  • Diuretics·penicillamine: zinc excretion impact
  • Pregnancy·lactation: standard doses (11~13mg) safe
  • Gastric discomfort: with meals
  • Supplementation after serum zinc test: confirm deficiency first
  • NIHL·presbycusis: target if zinc deficiency present, reduced effect if normal
  • Sudden hearing loss: emergency physician immediately

Synergy matrix

  • Zinc + copper 8:1: zinc-copper balance matrix
  • + Ginkgo EGb 761: hearing·microcirculation matrix
  • + Magnesium: mineral·NMDA matrix
  • + NAC + vitamin ACE: antioxidant matrix
  • + CoQ10: mitochondrial matrix
  • + Hearing aids·auditory rehabilitation: medical adjunct

Consumer message

Chronic tinnitus·hearing decline + reduced taste·smell·frequent colds·acne signal zinc deficiency (2030% Korean population). Zinc bisglycinate 30mg/day 12-week cumulative gains: tinnitus severity -28%, hearing +15%, SOD +25%, depression·anxiety -25%. Deficient patient core target. 15,00035,000 KRW/60 caps. 30mg+ chronic use copper 8:1 matrix. Caveats: antibiotic·diuretic·pregnancy physician assessment, serum zinc test before supplementation recommended. Oysters·beef·pumpkin seeds natural assets. Pairs with ginkgo·magnesium·NAC·CoQ10 matrix. Spring 2026 hearing·tinnitus matrix.