howtosupplement
Immunity/Inflammation/Heart

Shiitake

Edible mushroom extract rich in beta-glucans that may support immune markers and mild cardiometabolic health in adults.

Shiitake

Shiitake

43
score
C
evidence
Caution
risk

Proven Benefits

01May improve immune markers
02May lower CRP and cytokines
03May improve total/LDL cholesterol
04May reduce oxidative stress markers

Chemical Forms

Recommended
  • Fruiting body hot-water extract
  • Whole fruiting body powder
  • Dual extract (water + alcohol)
Avoid
  • Myceliated grain biomass (lower mushroom content, more starch)
  • Raw or minimally processed powders from undercooked shiitake (higher dermatitis/GI risk)
Expert Note

Most studied shiitake actives are beta-glucans concentrated in the fruiting body, and hot-water extraction is the standard way to make them available. Products made mostly from mycelium grown on grain can contain much less actual mushroom and more starch, while raw or underprocessed shiitake is less desirable for tolerance.

Protocol

Amount
500 mg-1.5 g extract
Frequency
Once daily or split into 2 doses
When
With food is usually best for tolerance; consistency matters more than timing.

Condition-Based Dosing

Whole dried mushroom powder
5-10 g daily for 4 weeks
Hot-water extract
500-1500 mg daily

Safety & Limits

Upper Safe Limit
No official UL; most oral human studies stay at or below 10 g/day dried mushroom or equivalent extract.
Cycling
Safe for continuous use

Contraindications

Mushroom allergy — may trigger rash, itching, or other hypersensitivity reactions
Immunosuppressive drugs or organ transplant status — may oppose intended immune effects
Autoimmune disease — immune-stimulating extracts may worsen symptoms in susceptible people
Pregnancy or breastfeeding — limited safety data for concentrated supplemental use beyond normal food intake
Updated Invalid Date