Cordyceps vs Selenium (Selenomethionine)
Adaptogen vs Mineral · evidence-backed comparison
- • Selenium (Selenomethionine) has the stronger evidence base (moderate (some rcts)).
- • Cordyceps has the broader effect profile across the 9 effect categories.
- • Selenium (Selenomethionine) is cheaper per serving ($0.10 vs $0.60).
- • Cordyceps has a slightly cleaner safety profile.
- • Selenium (Selenomethionine) has higher bioavailability (better absorption).
Side-by-side traits
| Trait | Cordyceps | Selenium (Selenomethionine) |
|---|---|---|
Category | Adaptogen | Mineral |
Active compound | Cordycepin, polysaccharides | Selenomethionine |
Form available | Capsule, Powder | Capsule, Tablet |
Source | fungal | synthetic |
Typical dose | 1–3 g daily | 100–200 mcg daily |
Dose range | 1–3 g | 100–200 mcg |
Loading protocol | — | — |
Best taken with | with food | with food |
Best time of day | morning | any |
Bioavailability How efficiently the body absorbs and utilizes the compound. | Moderate (3/5) | Very High (5/5) |
Onset time | Cumulative: 3–6 weeks | Cumulative: 4–12 weeks |
Half-life | — | ~252 days (long body store) |
Evidence level Quality and quantity of human research. | Limited (small studies) | Moderate (some RCTs) |
Overall effect Subjective effect magnitude. | Low (2/5) | Low (2/5) |
Muscle / strength | Low (2/5) | Very Low (1/5) |
Physical energy | High (4/5) | Low (2/5) |
Focus / cognition | Low (2/5) | Very Low (1/5) |
Mood / stress | Low (2/5) | Low (2/5) |
Sleep quality | Very Low (1/5) | Very Low (1/5) |
Immunity | High (4/5) | Moderate (3/5) |
Recovery Post-exercise recovery support. | Moderate (3/5) | Low (2/5) |
Longevity / healthspan | Moderate (3/5) | Moderate (3/5) |
Safety rating 5 = exceptionally well-tolerated; 1 = significant risk profile. | High (4/5) | Moderate (3/5) |
Price per serving Approximate USD per typical daily dose. | $0.60 | $0.10 |
Vegan friendly | Yes | Yes |
Gluten free | Yes | Yes |
3rd-party tested | Yes | Yes |
About Cordyceps
Medicinal mushroom that may improve VO2 max and oxygen utilization in untrained adults. Best evidence is for endurance and immune support.
About Selenium (Selenomethionine)
Cofactor for glutathione peroxidase and thyroid hormone activation. Two Brazil nuts per day already meet requirements; toxicity above 400 mcg.
Vetted brands, third-party testing, ships worldwide.
Vetted brands, third-party testing, ships worldwide.
Cordyceps safety
Common side effects:
- • Mild GI upset
- • Dry mouth
Avoid if:
- • Bleeding disorders
- • Autoimmune disease
Drug interactions:
- • Anticoagulants
- • Immunosuppressants
Selenium (Selenomethionine) safety
Common side effects:
- • Selenosis (>400 mcg/day): hair loss, garlic breath, brittle nails
Avoid if:
- • Already eating Brazil nuts daily
Drug interactions:
- • Anticoagulants
Common uses
- • Endurance
- • Immune support
- • Energy
- • Lung function
Stacks well with: Lion's Mane Mushroom
Common uses
- • Thyroid support
- • Hashimoto's
- • Antioxidant
Stacks well with: Iodine (Potassium Iodide)
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Medical disclaimer
SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements — especially if you are pregnant, breastfeeding, take prescription medication, or have a chronic condition.