L-Carnitine 
Carnitine is an essential amino acid. L-carnitine is an ideal ingredient in food, treats and supplements designed for weight management because it encourages the metabolism of fat.
Ingredient Glossary Search Results:
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L-Carnitine
L-Tryptophan
An amino acid that may be helpful to encourage the release of serotonin and melatonin in the brain.
Lamb
The fresh whole meat from a lamb.
Lamb Meal
The fresh meat of a lamb with the moisture removed. One pound of meal is equal to three pounds of whole meat.
Larch Arabinogalactian
A prebiotic fiber that may be helpful to support the growth of friendly bacteria in the gut.
Lard 
Rendered fat from an animal, often treated with bleaching and deodorizing agents. Chemical preservatives are often added.
Lecithin
Derived from many sources including eggs, sunflower oil, and canola. It may enhance digestion of dietary fat, supports a heathy coat.
Lemon Balm
An herb that may be helpful to strengthen the brain and its ability to protect from stress and shock. Lemon Balm may work well for digestive upset that is caused by stress or anxiety.
Licorice
A plant that may be helpful to strengthen the Qi of the spleen and heart, moistens the lung, clears heat toxins, calms muscular spasms, and moderates the effects of other herbs. Often used to soothe and protect the digestive tract and helps with coughing.
Lignan
A fiber found in plants and may be used in some pet foods
Lungwort
An evergreen plant that may be helpful to thin out mucous to help expel it from the lungs.
Lysine
An essential amino acid.