Alanine

Alanine — a non-essential amino acid that plays a role in protein synthesis, energy metabolism, and maintaining normal blood sugar levels.

It plays a key role in gluconeogenesis — the formation of glucose from non-carbohydrate sources, which is especially important in low-carbohydrate and keto diets.

Alanine also supports immune activity and antibody production.

Although the body can synthesize alanine on its own, its intake from food may be important under conditions of increased stress or when there is a deficiency of other amino acids.

Beneficial properties

• participates in protein synthesis and maintenance of muscle mass;
• provides energy support through gluconeogenesis;
• stabilizes blood glucose levels;
• supports the immune system through antibody synthesis;
• affects carbohydrate and fat metabolism.

Daily requirement and sources of intake

The recommended daily dose of alanine is 1–2 g, and for athletes — up to 5–10 g.

The safe level is up to 150 mg per kg of body weight per day.

Sources of alanine:

• meat: beef, chicken, turkey;
• fish and seafood;
• eggs and dairy products;
• legumes and nuts.

Possible forms and their absorption

Nutrient forms are listed from best to worst:

L-alanine. The main biologically active form is involved in sugar metabolism, energy production, and immune function. It is well absorbed but is rarely used in supplements — the body synthesizes it itself, especially with adequate protein intake.

Beta-alanine. Does not participate in protein synthesis but increases carnosine levels in muscles, reducing acidosis and fatigue. Widely used in sports nutrition to enhance endurance and strength.

Show 10 products

iHerb

Codeage, Liposomal Beta-Alanine+, Centurion, CarnoSyn, Enhanced Absorption, 533 mg , 180 Capsules

≈ $36.37

Buy

iHerb

Nutricost, Beta-Alanine, 3,400 mg, 120 Capsules (850 mg per Capsule)

≈ $12.38

Buy

iHerb

Nutricost, Beta-Alanine, 240 Capsules (850 mg per Capsule)

≈ $19.51

Buy

iHerb

NOW Foods, Sports, Beta-Alanine, Endurance, 750 mg, 120 Veg Capsules

≈ $20.05

Buy

iHerb

PrePrimal, Beta-Alanine, 120 Capsules (850 mg per Capsule)

≈ $10.53

Buy

iHerb

Primaforce, Beta-Alanine, Unflavored, 7.1 oz (200 g)

≈ $22.20

Buy

iHerb

Primaforce, Beta-Alanine, Unflavored, 52.9 oz (1,500 g)

≈ $54.99

Buy

iHerb

Primaforce, Beta-Alanine, 3,400 mg, 180 Capsules (850 mg per Capsule)

≈ $15.06

Buy

iHerb

Primaforce, Beta-Alanine, Unflavored, 17.9 oz (500 g)

≈ $25.79

Buy

iHerb

Swolverine, Beta-Alanine, Unflavored, 10.58 oz (300 g)

≈ $53.31

Buy

D-alanine. Inactive in humans, not involved in metabolism. Not used in supplements.

Symptoms and consequences of deficiency

• fatigue, muscle weakness, decreased endurance;
• hypoglycemia — dizziness, sweating, irritability;
• weakened immunity and frequent infections;
• deterioration of cognitive functions and concentration;
• digestive disorders.

Alanine deficiency is rare and is usually associated with limited nutrition or physical exhaustion.

Possible risks of excess and their manifestations

• increased strain on the liver and kidneys;
• instability of blood sugar levels, possible fluctuations in glucose;
• headaches, fatigue, irritability;
• amino acid imbalance and metabolic disorders;
• possible allergic reactions or dyspepsia when taking supplements.

Excess is most often possible with prolonged use of supplements without control or with excessive protein intake.

Practical meaning for keto and LCHF

On a low-carbohydrate diet, alanine is relevant because of the glucose-alanine cycle. Muscle tissue can transfer nitrogen to the liver as alanine, and the liver can use it for gluconeogenesis. This helps maintain blood glucose without constant carbohydrate intake.

This does not mean alanine must be supplemented. When the diet contains enough complete protein from meat, fish, eggs, poultry, cottage cheese or cheese, the body usually has enough amino acids to synthesize alanine and handle nitrogen metabolism.

When needs may increase

Protein and amino acid intake deserve more attention during hard training, recovery from illness, low-calorie dieting and loss of muscle mass. In these cases, total protein and meal distribution matter more than isolated alanine capsules.

Alanine supplements do not replace medical evaluation when there is marked weakness, weight loss, blood sugar instability or liver disease. Diet, lab markers, medications and overall metabolic health need to be considered together.