No Thanks

Your 10% Off Promo Code is on the Way! Thanks for signing up for emails.

You're now signed up to receive exclusive deals and savings opportunities!

Thanks again for connecting with us. Keep an eye on your inbox — your first coupon is on its way!

Thank You! This email address is already signed up

You are signed up for the following:

  • Offers
  • Recipes
  • E-Newsletter
  • Updates & Reminders

Thank you for your interest and be assured that you will continue to receive our emails at this address.

Look for your next communication from us within the next week.


We are having trouble processing your request.

Our apologies!

Please try again later.


Have you ever stumbled across an unfamiliar word when reading about vitamins and supplements? Health and wellness can be a complex adventure. Maybe a new product features ingredients you've never heard of. Or maybe you just need a reminder about a certain term. When a quick reference check is needed, visit our Natural Health Glossary for a brief definition (or a link to more detailed information in our Health Encyclopedia). Be sure to keep this helpful, easy-to-search resource one click away: bookmark it!


Damiana: (dam-ee-YA-na) see damiana encyclopedia entry

Dandelion: (DAN-duh-lion) see dandelion encyclopedia entry

Demineralization: (dee-min-er-all-ih-ZAY-shun) The loss of minerals from bones.

Devil's Claw: (devil’s claw) see devil's claw encyclopedia entry

DHA (docosahexaenoic acid): (doe-co-sah-heck-sah-NO-ick  Ah-sid) An omega-3 fatty acid found primarily in cold-water fish. see encyclopedia entry

DHEA (dehydroepiandrosterone): (dee-high-drow-ep-ee-an-DROW-stare-own) A steroid hormone produced in the adrenal glands, it is converted by the body into other hormones. see DHEA encyclopedia entry

Diastolic: (die-a-STALL-ick) Blood pressure during the relaxation phase of the heart beat. It is the second number given in a blood pressure reading.

Diosgenin: (die-OZ-jen-in) A compound found in Mexican wild yam root, similar to the female hormone progesterone in structure.

DNA (deoxyribonucleic acid): (dee-OX-see-rye-bo-new-clay-ick  A-sid) The complex protein chemical that is the main carrier of genetic information in cells.

Dong Quai: (dong-kwhy) see dong quai encyclopedia entry

Double-blind study: (double-blind study) A method of protecting against experimental bias by ensuring that neither the test subjects nor the researchers know which subjects are receiving actual treatment and which are receiving placebo.

Duodenum: (do-ODD-in-um) The upper portion of the small intestine.

back to top


Echinacea: (eck-in-AY-sha) see echinacea encyclopedia entry

Elderberry: (ELLE-der-bear-ee) see elderberry encyclopedia entry

Electrolytes: (ih-LECK-trow-lights) Minerals that dissolve in water and are capable of carrying electrical charges.

Eleuthero: (ih-LOO-thuh-row) see eleuthero encyclopedia entry

Enteric-coated: (en-TARE-ick  coated) A tablet or capsule that is coated so it is not dissolved in the stomach and arrives at the intestinal tract intact.

Enterolactone: (en-terra-LACK-tone) A mammalian lignan produced by intestinal microflora from precursors present in plant-based foods.

Enzyme: (EN-zime) A protein that speeds up chemical reactions in the body.

EPA (eicosapentaenoic acid): (eye-co-sah-PEN-tah-no-ick  A-sid) An omega-3 fatty acid found primarily in cold-water fish. see EPA encyclopedia entry

Ephedra: (ih-FED-ra) see ephedra encyclopedia entry

Epinephrine: (ep-uh-NEF-rin) see Adrenaline.

Essential fatty acids (EFAs): (essential fatty acids) Fatty acids that are required by the body but cannot be manufactured in the body. They must be obtained from the diet.

Essential oils: (essential oils) Also known as volatile oils or essences. Complex mixtures of a variety of organic compounds that evaporate when exposed to air. They often give plants their distinct aromas.

Estrogen: (ESS-trow-jen) The primary female hormone, made by the ovaries and uterus.

Evening Primrose Oil: (evening primrose oil) see evening primose oil encyclopedia entry

Extract: (EK-strakt) A solution that contains the active compounds of a plant material or other substance.

Eyebright: (eyebright) see eyebright encyclopedia entry

back to top


Fat-soluble: (fat SOLL-yoo-ball) Describing any substance that dissolves in fat. Fat-soluble vitamins include A, E, D, and K.

Fennel: (FEN-ill) see fennel encyclopedia entry

Fenugreek: (FEN-yoo-greek) see fenugreek encyclopedia entry

Feverfew: (FEE-ver-few) see feverfew encyclopedia entry

Flavonoids: (FLAV-ah-noydz) A group of flavone-containing compounds that includes many plant pigments. These pigments may exert a variety of physiological effects in the body.

Flax/Flaxseed: (flaks) see flax/flaxseed encyclopedia entry

Folic Acid: (FOE-lick Ah-sid) see folic acid encyclopedia entry

Fo-Ti: (FOE-tee) see fo-ti encyclopedia entry

Free radicals: (free  RAD-ick-allz) Highly reactive oxygen molecules that can destroy cellular compounds, damaging tissues.

Fructooligosaccharides (FOS): (FROOK-toe-all-ih-go-SACK-a-ridez  ) Natural sugars that help nourish beneficial bacteria in the large intestine. see fructooligosaccharides encyclopedia entry

back to top

New to Natural Health?
Customer Service
  • Live Chat
    7am–12am CT Mon–Fri
    8am-12am CT Sat
  • Call Us
  • Para Ordenes en Español
  • 1-800-254-1885

Easy Refill

  • Get your favorite products delivered automatically
  • 10% off future orders of Swanson brand products in your subscription
  • FREE standard shipping on all future orders over $50
  • Control the frequency, delivery date, item quantity... or cancel at any time
  • Email reminders before each delivery
See all FAQs here