Comprehensive Support for Histamine Challenges

Digest12 2 bottles

Special Offer *

Buy 12 Natural D-Hist or D-Hist Jr. and get 2 free

Use promo code: DHIST30C

Buy 12 Natural D-Hist 120-count and get 1 box of 12 blister packs free

Use promo code: DHIST30B

*Cannot be combined with any other offer, promotion or discount. Applies to Ortho Molecular Products brand only. Qualifying orders must be 12 of the same item. Offer expires 4/30/2019.


The most trusted professional formula for seasonal challenges and mast cell stabilization.

Quercetin and stinging nettles leaf stabilize and control mast cell degranulation.

Bromelain breaks down circulating allergenic protein complexes to reduce sensitivity.

N-acetyl cysteine (NAC) clears the airways by breaking down mucus and improving airflow.

Amino Acid Chelates Image

Did You Know?

Quercetin blocks mast cell breakdown so effectively that researchers have used it as the mast cell stabilization standard for decades. Because it acts so quickly, quercetin is the ideal clinical tool for food sensitivities, respiratory challenges, skin irritations and other hyper-immune reactions.


Our 30-Year Commitment to Efficacy



Guaranteed Results

For decades, Natural D-Hist has demonstrated our promise of innovative formulas that deliver consistent patient results.


What Patients Need to Know

With the availability of less expensive, imitation products offered by online retailers, it is important that your patients understand the true value of product efficacy.

  • Proven formulation of therapeutic, well-studied ingredients
  • Uncompromising raw material selection and verification
  • Consistent, guaranteed patient results