Kirkland Sleep Aid Ingredients.  The active ingredient in Kirkland Sleep Aid is ‘doxylamine succinate’, an antihistamine. It is a substance used to treat allergies but also works to induce sleep and help people stay asleep. In fact, doxylamine works more effectively to help those with insomnia than those suffering from allergies.

Kirkland Sleep Aid Ingredients

Kirkland Sleep Aid Ingredients

There’s a fair amount of chemistry on this page, but don’t worry too much.  There is just one ‘active’ ingredient in Kirkland Sleep Aid, doxylamine succinate.  The other ingredients, listed below, are not compounds designed to make you sleep, but are some of the standard ‘building blocks’ of any tablet.  These ingredients are inactive, that is, they don’t do anything to you.

Doxylamine Succinate

Each Kirkland Sleep Aid tablet contains 25mg of doxylamine succinate, the ‘active’ ingredient, that is, the ingredient which makes you sleepy.

Doxylamine is an antihistamine, used to relieve symptoms of allergy, hay fever, and the common cold. This medication works by blocking certain natural substances (histamine, acetylcholine) that your body makes. This effect helps to relieve allergy/cold symptoms such as watery eyes, runny nose, and sneezing.

Inactive Ingredients

  • Dibasic Calcium Phosphate (or Dicalcium Phosphate)
    Dibasic Calcium Phosphate is an ionic salt, meaning it’s made up of charged particles of calcium and phosphate, both of which humans need in the diet. While dicalcium phosphate isn’t as common a nutritional supplement as the more familiar tricalcium phosphate, it still shows up occasionally on nutrition labels as a means of adding calcium to a food.
  • FD&C Blue No.1 Aluminum Lake
    FD&C Blue No. 1 Aluminum Lake is a FDA-approved color commonly used to dye dosage forms such as tablets and capsules. FD&C Blue No. 1 Aluminum Lake is approved for use in foods, drugs and cosmetics.
  • Magnesium Stearate
    Magnesium stearate is a salt that is produced when a magnesium ion bonds with two stearate molecules. Stearate is just the anion form of stearic acid, which you’ve most likely heard of before. Stearic acid is a long-chain saturated fat that is abundant in beef, cocoa butter, coconut oil, and other natural foods.
  • Microcrystalline Cellulose
    Microcrystalline cellulose (MCC) is a term for refined wood pulp and is used as a texturizer, an anti-caking agent, a fat substitute, an emulsifier, an extender, and a bulking agent in food production. The most common form is used in vitamin supplements or tablets.
  • Sodium Starch Glycolate
    Sodium starch glycolate is used as a pharmaceutical grade dissolution excipient for tablets and capsules. Sodium starch glycolate absorbs water rapidly, resulting in swelling which leads to rapid disintegration of tablets and granules.

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