What it does in the body
- No established physiological function in humans
- Claimed immunomodulatory effects (unproven in humans)
- Claimed antioxidant properties (limited evidence)
- Claimed interferon-inducing activity (cell studies only)
- No confirmed essential role
How much you need (Daily Value)
| Group | Recommended | Source |
|---|---|---|
| Adult male | No RDA; estimated dietary intake 0.4-3.5 mg/day | Estimated |
| Adult female | No RDA; estimated dietary intake 0.4-3.5 mg/day | Estimated |
| Pregnancy | No RDA; avoid supplements | N/A |
| Children | No RDA established | N/A |
| Older adults | No RDA established; avoid supplements | N/A |
Richest food sources
| Food | Amount | Where |
|---|---|---|
| Garlic | 0.75 mg per 100g | global |
| Ginseng root | 0.3-4.3 mg per 100g | East Asia |
| Shiitake mushrooms | 0.4 mg per 100g | East Asia |
| Aloe vera | 0.2-0.7 mg per 100g | global |
| Comfrey | 0.2 mg per 100g | Europe |
| Pearl barley | 0.1 mg per 100g | global |
| Tuna | 0.05 mg per 100g | global |
| Tomato juice | 0.05 mg per 100ml | global |
If you don't get enough
Mild: No deficiency state recognized in humans
Moderate: No deficiency state recognized
Severe: No deficiency state recognized — germanium is not considered essential
Time to onset: Not applicable — deficiency not recognized.
Too much
Upper limit: No established UL. FDA warning against germanium supplements due to nephrotoxicity.
Inorganic germanium: renal tubular degeneration, renal failure, death. Peripheral neuropathy, myopathy, hepatic dysfunction. Organic Ge-132: generally lower toxicity but long-term safety unestablished. Several deaths reported from germanium supplements.
How well you absorb it
Organic germanium (Ge-132): well absorbed, rapidly excreted. Inorganic germanium: absorbed and accumulates in kidneys (dangerous).
Helped by: Not applicable — supplementation not recommended
Hindered by: Not applicable
Cooking & storage
Germanium is heat-stable. Cooking does not significantly affect germanium content. Garlic and mushrooms retain germanium through cooking processes.
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