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Immune

Functional Yeast Extract (Saccharomyces cerevisiae) Cell Wall

Also known as: Baker's yeast extract, Saccharomyces cerevisiae cell wall, Yeast beta-glucan, Nutritional yeast extract

C
Evidence

Functional yeast extract is derived from baker's yeast cell walls and is standardized to contain beta-glucans, polysaccharides that may support immune function. Research suggests beta-glucans can enhance innate immune responses, though human clinical evidence remains limited.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

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Primary uses

  • Immune system support
  • Innate immune enhancement
  • General wellness

How it works

  • Beta-glucan binding to pattern recognition receptors (Dectin-1) on immune cells
  • Activation of macrophages and natural killer cells
  • Modulation of complement system

Dosage

Typical range
500–2000 mg daily
Timing
Can be taken with or without food; consistent daily use recommended for immune benefits
With food
Optional; may be taken anytime
Duration
Intended for regular use; immune effects typically assessed over weeks to months
Special populations
Generally recognized as safe for most adults; limited safety data in pregnant/nursing women

Forms

  • Capsule· 70/100
  • Powder· 70/100

Safety

Common side effects

  • Rare: mild digestive upset
  • Rare: allergic reactions in yeast-sensitive individuals

Contraindications

  • Yeast allergy or Saccharomyces sensitivity
  • Severe immunocompromise (consult healthcare provider)

Evidence notes

Good mechanistic and in vitro evidence for beta-glucan immunomodulation. Some human studies show immune marker improvements (NK cell activity, cytokine production), but limited large-scale RCT data for clinical outcomes. Yeast extract extracts are less studied than purified beta-glucan isolates.

Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.