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!


Maca: (MAH-kah) see maca encyclopedia entry

Magnesium: (mag-KNEE-zee-um) see magnesium encyclopedia entry

Maitake: (my-TOCK-ee) see maitake encyclopedia entry

Malabsorption: (ma-lub-SORP-shun) Impaired absorption of nutrients during digestion, often due to diarrhea.

Malate: (MAY-late) Any salt of malic acid.

Malic Acid: (MAY-lick  Ah-sid) see malic acid encyclopedia entry

Manganese: (MAN-ga-knees) A trace mineral required for many body functions, including blood clotting and protein digestion. see manganese encyclopedia entry

MAO (monoamine oxidase) inhibitors: (MAO inhibitors) A class of antidepressants that inhibit the breakdown of certain neurotransmitters in the brain.

Melatonin: (mel-ah-TONE-in) see melatonin encyclopedia entry

Methionine: (ma-THIGH-uh-neen) An essential, sulfur-containing amino acid.

Methylsulfonylmethane (MSM): (MSM) see MSM encyclopedia entry

Milk Thistle: (milk thistle) see milk thistle encyclopedia entry

Mitochondria: (might-o-CON-dree-uh) Rod-shaped structures in cells that serve as miniature power plants, converting glucose into energy.

Molybdenum: (ma-LIB-den-um) An essential trace mineral required for the production of certain enzymes and for normal growth and development. see molybdenum encyclopedia entry

Momordica: (ma-MORE-dee-ca) see momordica encyclopedia entry

Mucilage: (MEW-sill-age) Soluble fiber found in beans, seeds, nuts, and grains.

Myocardium: (my-oh-CARD-ee-um) The thickest layer of the heart wall, composed of cardiac muscle.

back to top


N-acetyl cysteine (NAC): (en-ah-SEAT-ill SIS-teen) A form of the amino acid cysteine. see NAC encyclopedia entry

NADH: (NADH) see NADH encyclopedia entry

Naringen: (nah-RIN-jin) A flavonoid found in grapefruit.

Nettle: (nettle) see nettle encyclopedia entry

Neural tube defect: (NEW-rall tube defect) A birth defect that happens when the brain, spinal cord, and vertebrae don't develop normally during the first month of pregnancy.

Neurotransmitters: (new-row-trans-MITT-erz) Chemicals that transmit messages among brain cells and along nerves.

Niacin: (NIGH-ah-sin) Vitamin B-3. see niacin encyclopedia entry

Non-essential amino acid: (non-essential amino acid) Any of the amino acids that can be made within the body from the nine essential amino acids. 

Noni: (NO-nee) see noni encyclopedia entry

Nopal Cactus: (NO-pall  cactus) see nopal cactus encyclopedia entry

Norepinephrine: (NOR-ep-uh-NEFF-rin) A hormone that constricts blood vessels and raises blood pressure. Also called noradrenaline.

back to top


Olive Leaf: (olive leaf) see olive leaf encyclopedia entry

OPCs (oligomeric proanthocyanidins): (OPCs) Antioxidant flavonoids found in red wine and some plants. Most OPC supplements are made from grapeseeds or pine bark.

Oxide: (OCK-side) Any compound of an element or radical with oxygen.

Oscillococcinum: (o-sill-o-cox-see-num) A popular European homeopathic flu medicine.

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