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Ortho Molecular Products

Natural D-Hist

Natural D-Hist

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Natural D-Hist is a blend of flavonoids, antioxidants, proteolytic enzymes and botanicals designed to provide support for seasonal challenges caused by common environmental allergens.

120 capsules

Clinical Applications


Quercetin is a biologically active flavonoid antioxidant that is widely distributed in plants including oak trees, onions and tea. Quercetin is described to have preliminary evidence for supporting endothelial barrier integrity and is described to influence some aspects of platelet aggregation and signalling.

Stinging Nettles Leaf

Urtica dioica, commonly known as stinging nettles, is a plant that has been shown in herbal medicine to help relieve seasonal allergy symptoms and act as a supportive therapy to help relieve rheumatic complaints. Stinging nettle has been used as a component of prepared medicines intended for supportive treatment of rheumatic ailments.


Bromelain is a plant enzyme naturally found on the stem and fruit of the pineapple plant. Bromelain is a proteolytic enzyme that aids in the breakdown of large protein complexes and has been shown to enhance the absorption of quercetin.

N-Acetyl Cysteine

N-acetyl cysteine (NAC) provides antioxidants. It is also an amino acid precursor to one of the most important antioxidants in the body, glutathione.

Vitamin C

Vitamin C cannot be synthesized by humans and is therefore an essential nutrient that must be consumed in the diet. Among its numerous health-promoting properties, vitamin C helps in wound healing, connective tissue formation and the development and maintenance of bones, cartilage, teeth and gums and is an antioxidant for the maintenance of good health.