Verification of quantum biological predictions for weak magnetic field effects on superoxide in planarians

PNAS Nexus · 2026 · Mixed · Low evidence

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MixedLow evidencePaper 6875

Study snapshot

PublicationPNAS Nexus · 2026

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

The dependence of superoxide concentration and tissue regeneration on weak magnetic field strength in planarians exhibits a nonmonotonic behavior that classical physics struggles to explain. Here, we experimentally verify the predictions of a simple radical pair (RP) model for magnetic field modulation of superoxide levels during planarian regeneration. The model predicted increased superoxide concentrations at both hypomagnetic and higher fields (>500 µT). Previously reported magnetic field effects on blastema size do not follow the same pattern as our predictions for superoxide levels, while in earlier experiments blastema size was correlated with superoxide levels within a narrower magnetic field range (200 and 500 µT). Surprisingly, our experiments confirmed the model’s predictions. We also performed a search over the parameter space of a more general RP model and identified multiple parameter sets that produce magnetic field profiles consistent with the observed ranges of superoxide levels. While the precise relationship between blastema size and superoxide concentration is evidently more complex than previously thought, and important biochemical aspects—including the identities of the radicals involved—remain to be determined, our findings support a general RP hypothesis and bolster the case for a quantum-biological explanation for these magnetic field effects.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeanimal

Effect directionmixed

Populationplanarians

Sample sizeNot supplied

Exposurestatic/weak magnetic field

Evidence strengthLowConfidence: 82% · Peer reviewed: yes

Main findings

The study reports nonmonotonic dependence of superoxide concentration and tissue regeneration on weak magnetic field strength in planarians. Experiments confirmed predictions of a radical pair model, with increased superoxide concentrations at hypomagnetic and higher fields above 500 µT, while the relationship between blastema size and superoxide concentration appeared more complex than previously thought.

Outcomes measured

superoxide concentration
tissue regeneration
blastema size

Limitations

Sample size not stated in the abstract.
Exposure duration not stated in the abstract.
Precise relationship between blastema size and superoxide concentration remains unclear.
Important biochemical aspects, including the identities of the radicals involved, remain to be determined.

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "static/weak magnetic field",
    "source": "experimental magnetic field exposure",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "planarians",
  "sample_size": null,
  "outcomes": [
    "superoxide concentration",
    "tissue regeneration",
    "blastema size"
  ],
  "main_findings": "The study reports nonmonotonic dependence of superoxide concentration and tissue regeneration on weak magnetic field strength in planarians. Experiments confirmed predictions of a radical pair model, with increased superoxide concentrations at hypomagnetic and higher fields above 500 µT, while the relationship between blastema size and superoxide concentration appeared more complex than previously thought.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not stated in the abstract.",
    "Exposure duration not stated in the abstract.",
    "Precise relationship between blastema size and superoxide concentration remains unclear.",
    "Important biochemical aspects, including the identities of the radicals involved, remain to be determined."
  ],
  "evidence_strength": "low",
  "confidence": 0.82,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "planarians",
    "weak magnetic field",
    "hypomagnetic field",
    "superoxide",
    "tissue regeneration",
    "blastema size",
    "radical pair model",
    "quantum biology",
    "nonmonotonic response"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1093/pnasnexus/pgag152
PubMed: Not supplied

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