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Sodium Oligomannate

Sodium oligomannate (GV-971) is an oligosaccharide from marine algae approved in CHINA for mild-to-moderate Alzheimer's disease (2019). CONTROVERSIAL approval - based on a single Phase 3 trial with concerns about methodology. Proposed mechanism involves gut microbiome modulation. NOT approved by FDA or EMA. NO international GRADED OUTCOMES. If considering, understand the limitations of current evidence. Research is ongoing but initial claims remain disputed.

Quick Answer

What it is

Sodium oligomannate (GV-971) is an oligosaccharide from marine algae approved in CHINA for mild-to-moderate Alzheimer's disease (2019). CONTROVERSIAL approval - based on a single Phase 3 trial with concerns about methodology.

Key findings

  • Grade C: Cognitive Function in Alzheimer's Disease
  • Grade D: Gut Microbiome Composition
  • Grade D: Neuroinflammation

Safety

No specific caution or interaction language was detected in the current summary/outcome notes.

ℹ️ Quick Facts: Sodium Oligomannate

Quick Facts: Sodium Oligomannate

  • Best Evidence:Grade C
  • Conditions Studied:1
  • Research Outcomes:3
  • Key Effect:Alzheimer’s Disease
Outcomes by grade:
A0
B0
C1
D2
1 conditions · 3 outcomes

Detailed Outcomes

C
Cognitive Function in Alzheimer's Disease
A Chinese Phase 3 RCT (n=818, 36 weeks) found a statistically significant improvement in ADAS-Cog12 scores (-2.15 points vs placebo, p<0.0001), but secondary endpoints (CIBIC+, ADCS-ADL) were not significant. A Phase 2 RCT (n=242, 24 weeks) did not reach significance on the primary ADAS-Cog12 endpoint (p=0.30 for 900mg). A small RCT (n=72, 48 weeks) reported improvements comparable to donepezil. A meta-analysis of 3 RCTs (n=1,108) favored GV-971 on ADAS-Cog12 but not other scales. Graded C rather than B due to inconsistent primary endpoint results across trials, failure to meet secondary endpoints, early termination of the global Phase 3 replication trial, and non-renewal of China's conditional approval in 2024.
small↑Improves
D
Gut Microbiome Composition
In preclinical studies using 5xFAD transgenic Alzheimer's mouse models, oral GV-971 remodeled gut microbiota composition, reduced phenylalanine and isoleucine concentrations in feces and blood, and shifted microbial enterotypes. Two small human MCI cohorts showed elevated amino acid levels and Th1 frequency consistent with animal findings, but no controlled human trials have evaluated microbiome changes as a primary endpoint.
small↑Improves
D
Neuroinflammation
In 5xFAD transgenic mice, GV-971 reduced Th1-mediated peripheral immune cell infiltration into the brain, decreased M1 microglial activation, and lowered hippocampal amyloid-beta and tau accumulation. These preclinical findings suggest an anti-neuroinflammatory mechanism via gut-brain axis modulation, but no human trials have directly measured neuroinflammation as an outcome.
moderate↓Improves

Evidence by Condition

Best grade per condition (each condition may have multiple outcomes)

CAlzheimer’s Disease
1
↑Cognitive Function in Alzheimer's DiseaseImproves

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