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L-aspartic acid - function, effect & importance for protein metabolism

Aspartic acid is a proteinogenic amino acid that supports protein synthesis. L-aspartic acid promotes ammonia detoxification and can increase physical endurance.

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Things worth knowing about "L-aspartic acid"

An amino acid that plays a role in the energy cycle and in the synthesis of other amino acids.

What Is L-Aspartic Acid?

L-aspartic acid is a naturally occurring, non-essential amino acid that the human body can produce on its own. It plays a central role in energy metabolism, in the formation of other amino acids, and in the urea cycle. As a building block of proteins and as a neurotransmitter precursor, L-aspartic acid is involved in numerous biological processes.

Biochemical Properties and Occurrence

L-aspartic acid belongs to the group of acidic amino acids and carries a negative charge at physiological pH. It is a component of many endogenous proteins and is found in virtually all protein-containing foods. Foods particularly rich in L-aspartic acid include meat and poultry, fish and seafood, legumes such as soybeans and lentils, nuts and seeds, and asparagus, after which the amino acid was originally named.

Biological Functions

L-aspartic acid fulfills diverse roles in the human body. It is an important component of the urea cycle, through which ammonia is detoxified and excreted as a metabolic waste product. It is also involved in the citric acid cycle, a central process of cellular energy production. L-aspartic acid serves as a precursor for the synthesis of other amino acids, including asparagine, methionine, threonine, and lysine. In the central nervous system, L-aspartic acid acts as an excitatory neurotransmitter and is involved in signal transmission between nerve cells.

L-Aspartic Acid and Sport

In the field of sports nutrition, L-aspartic acid, often in the form of aspartate salts such as magnesium aspartate or potassium aspartate, is discussed as a performance-enhancing supplement. It is thought to improve ammonia detoxification during intense physical exertion and thereby support endurance performance. However, the scientific evidence for a significant performance-enhancing effect in healthy individuals has not yet been conclusively established. Some studies suggest a possible reduction in fatigue symptoms, while others show no measurable effect.

Aspartic Acid as a Sweetener Component

L-aspartic acid is known as a component of the sweetener aspartame. Aspartame consists of L-aspartic acid and L-phenylalanine and is used in numerous foods and beverages as a low-calorie sugar substitute. People with the rare metabolic disorder phenylketonuria must avoid aspartame, as they are unable to break down phenylalanine.

Recommended Intake and Safety

As L-aspartic acid is a non-essential amino acid, there is no official recommended daily intake. The body can produce sufficient amounts on its own with a balanced diet. Targeted supplementation is generally not necessary for healthy individuals. High-dose preparations should be avoided without medical advice, as excessive amounts of excitatory amino acids could theoretically have neurotoxic effects, although this is considered unlikely at typical oral doses.

References

Lehninger, A. L., Nelson, D. L., Cox, M. M. - Lehninger Principles of Biochemistry. W. H. Freeman and Company, 7th edition, 2017.
Griffith, O. W. - Mammalian sulfur amino acid metabolism: an overview. Methods in Enzymology, 1987.
European Food Safety Authority (EFSA) - Scientific Opinion on the safety of aspartame. EFSA Journal, 2013.

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