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2 min read

Cordyceps Supplements - Legal? Cs-4 vs. Militaris – What's the Real Deal in 2025?

Cordyceps is booming as a supplement for energy, lungs, kidneys, and recovery. But not all Cordyceps are equal – and in the UK/EU, regulations make a big difference.

Key Strains Breakdown

  • Cs-4 (fermented mycelium, often called Paecilomyces hepiali / Samsoniella hepiali)
    The strain behind 95% of human clinical studies (mostly from China).
    Prescribed in Asia (e.g., JinShuiBao brand) for decades.
    Officially recognized as a safe substitute for wild Cordyceps sinensis.
  • C. militaris (fruiting body)
    Popular for high cordycepin (antiviral potential in lab studies).
    Growing evidence for performance and inflammation.

Strong Evidence for Cs-4

  • Kidney protection (CKD stages 3–4): Slows eGFR decline, reduces proteinuria (multiple RCTs/meta-analyses).
  • Lungs (COPD/asthma): Improves FEV1 by ~8–12%, fewer exacerbations (strongest data base).
  • Exercise in older adults: Boosts VO₂ max 7–11% at 3g/day.
  • Energy/fatigue: Solid for general boosts; some post-viral benefits emerging.
  • Other uses: Supports chemo recovery; mixed/weak for diabetes, thyroid, depression.

Weaker or Overhyped Claims

  • No "70–85% improvement" in chronic/post-viral fatigue from multiple RCTs.
  • Cordycepin levels: Actually higher in militaris, not Cs-4.
  • Not 200+ dedicated trials – dozens, mostly Chinese.

Cs-4 Advantages

  • Consistent composition (lab-fermented).
  • Lower heavy metal risk vs. wild.
  • Higher mannitol for kidney effects.

UK/EU Legal Status (December 2025)

  • Cs-4 (Samsoniella hepiali mycelium): Legal to sell – clarified as non-novel (same status as wild Cordyceps sinensis mycelium).
  • C. militaris: Novel food – requires authorisation; currently restricted/unauthorised in most cases. Harder to find legally.

Bottom Line

If you want the proven clinical track record (kidneys, lungs, endurance) and legal availability in the UK/EU → Go for Cs-4.
Militaris shines in lab data for cordycepin, but lacks the human evidence volume and faces regulatory hurdles.

Typical dose: 2–3g/day. Always check labels for strain and consult a doctor. Evidence is promising but often from lower-quality Chinese studies – more Western RCTs needed!

Curious what our own Cs-4 actually tests at? We had it independently verified at Flourish Labs in Oregon – see the full results here.