R MINVIT

Indications

• Herpes simplex virus infections
• Lysine deficiency

Dosage

Children: Refer to the BNF for Children for specific dosage recommendations.

Adults: Refer to the BNF for specific dosage recommendations.

Mechanism of action

Lysine inhibits the viral replication of the herpes simplex virus by altering the amino acid ratio in the tissue culture media. A higher concentration of L-lysine compared to L-arginine has been shown to reduce viral growth and cytopathogenicity. Additionally, lysine facilitates calcium absorption from the small intestine and is involved in protein synthesis through its role in the tRNA charging process, linking amino acids to their corresponding tRNA for translation.

Pharmacodynamics

Lysine ensures adequate calcium absorption and is involved in the formation of collagen, essential for bone, cartilage, and connective tissues. It aids in the production of various biological molecules, including antibodies, hormones, and enzymes. Deficiency in lysine can manifest as tiredness, inability to concentrate, irritability, and other health issues.

Pharmacokinetics

Lysine is absorbed in the small intestine and is transported in the bloodstream to various tissues, where it participates in protein synthesis and other metabolic processes. The metabolism of lysine involves its degradation and utilization in various biosynthetic pathways.

Adverse effects

• Gastrointestinal upset
• Diarrhea
• Nausea
• Abdominal pain

Precautions

• Use with caution in individuals with kidney disease
• Consult a healthcare professional before use if pregnant or breastfeeding

Pregnancy

Safety in pregnancy has not been established. Consult a healthcare professional before use.

Breast-feeding

Lysine is generally considered safe in breastfeeding, but consult a healthcare professional before use.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Oral tablet
• Oral capsule
• Powder for oral solution

Indications

• Methionine deficiency
• Hepatotoxicity prevention
• Cholesterol management

Mechanism of action

The mechanism of the possible anti-hepatotoxic activity of L-methionine is not entirely clear. It is thought that metabolism of high doses of acetaminophen in the liver leads to decreased levels of hepatic glutathione and increased oxidative stress. L-methionine serves as a precursor to L-cysteine, which has antioxidant properties and is a precursor to glutathione. The antioxidant activity of L-methionine and its metabolites likely contribute to its potential anti-hepatotoxic effects. Methionine also exhibits free-radical scavenging activity and chelating ability due to its sulfur content.

Pharmacodynamics

L-Methionine functions as a primary supplier of sulfur, which is essential for preventing hair, skin, and nail disorders. It aids in lowering cholesterol levels by enhancing the liver's production of lecithin, reducing liver fat, and protecting kidney function. Methionine acts as a natural chelating agent for heavy metals and helps regulate ammonia formation, contributing to ammonia-free urine and reduced bladder irritation. Furthermore, it influences hair follicles and promotes hair growth, in addition to its potential protective effects against hepatotoxins like acetaminophen.

Pharmacokinetics

Methionine is absorbed from the gastrointestinal tract and is distributed throughout the body, where it is utilized in protein synthesis and converted into other metabolites, such as S-adenosylmethionine and L-cysteine. The metabolism of methionine involves several pathways, including transsulfuration to cysteine and incorporation into proteins. The renal clearance of methionine is significant, as it is involved in the regulation of nitrogen balance and the formation of ammonia.

Adverse effects

• Nausea
• Vomiting
• Abdominal pain
• Allergic reactions

Precautions

• Use with caution in patients with liver disease
• Monitor for allergic reactions in sensitive individuals

Pregnancy

There is insufficient evidence to determine the safety of methionine during pregnancy. Consult a healthcare provider before use.

Breast-feeding

It is not known whether methionine is excreted in human milk. Caution is advised when administering to breastfeeding women.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Oral tablets
• Powder for oral solution

Mechanism of action

Proteins of the herpes simplex virus are rich in L-arginine, and tissue culture studies indicate an enhancing effect on viral replication when the amino acid ratio of L-arginine to lysine is high in the tissue culture media. When the ratio of L-lysine to L-arginine is high, viral replication and the cytopathogenicity of herpes simplex virus have been found to be inhibited. L-lysine may facilitate the absorption of calcium from the small intestine. Amino acids are selected for protein synthesis by binding with transfer RNA (tRNA) in the cell cytoplasm. The information on the amino acid sequence of each individual protein is contained in the sequence of nucleotides in the messenger RNA (mRNA) molecules, which are synthesized in the nucleus from regions of DNA by the process of transcription. The mRNA molecules then interact with various tRNA molecules attached to specific amino acids in the cytoplasm to synthesize the specific protein by linking together individual amino acids; this process, known as translation, is regulated by amino acids (e.g., leucine), and hormones. Which specific proteins are expressed in any particular cell and the relative rates at which the different cellular proteins are synthesized, are determined by the relative abundances of the different mRNAs and the availability of specific tRNA-amino acid combinations, and hence by the rate of transcription and the stability of the messages. From a nutritional and metabolic point of view, it is important to recognize that protein synthesis is a continuing process that takes place in most cells of the body. In a steady state, when neither net growth nor protein loss is occurring, protein synthesis is balanced by an equal amount of protein degradation. The major consequence of inadequate protein intakes, or diets low or lacking in specific indispensable amino acids relative to other amino acids (often termed limiting amino acids), is a shift in this balance so that rates of synthesis of some body proteins decrease while protein degradation continues, thus providing an endogenous source of those amino acids most in need. /Amino acids/ The mechanism of intracellular protein degradation, by which protein is hydrolyzed to free amino acids, is more complex and is not as well characterized at the mechanistic level as that of synthesis. A wide variety of different enzymes that are capable of splitting peptide bonds are present in cells. However, the bulk of cellular proteolysis seems to be shared between two multienzyme systems: the lysosomal and proteasomal systems. The lysosome is a membrane-enclosed vesicle inside the cell that contains a variety of proteolytic enzymes and operates mostly at acid pH. Volumes of the cytoplasm are engulfed (autophagy) and are then subjected to the action of the protease enzymes at high concentration. This system is thought to be relatively unselective in most cases, although it can also degrade specific intracellular proteins. The system is highly regulated by hormones such as insulin and glucocorticoids, and by amino acids. The second system is the ATP-dependent ubiquitin-proteasome system, which is present in the cytoplasm. The first step is to join molecules of ubiquitin, a basic 76-amino acid peptide, to lysine residues in the target protein. Several enzymes are involved in this process, which selectively targets proteins for degradation by a second component, the proteasome. /Amino acids/

Pharmacodynamics

Insures the adequate absorption of calcium; helps form collagen ( which makes up bone cartilage & connective tissues); aids in the production of antibodies, hormones & enzymes. Recent studies have shown that Lysine may be effective against herpes by improving the balance of nutrients that reduce viral growth. A deficiency may result in tiredness, inability to concentrate, irritability, bloodshot eyes, retarded growth, hair loss, anemia & reproductive problems.

Mechanism of action

The mechanism of the possible anti-hepatotoxic activity of L-methionine is not entirely clear. It is thought that metabolism of high doses of acetaminophen in the liver lead to decreased levels of hepatic glutathione and increased oxidative stress. L-methionine is a precursor to L-cysteine. L-cysteine itself may have antioxidant activity. L-cysteine is also a precursor to the antioxidant glutathione. Antioxidant activity of L-methionine and metabolites of L-methionine appear to account for its possible anti-hepatotoxic activity. Recent research suggests that methionine itself has free-radical scavenging activity by virtue of its sulfur, as well as its chelating ability. Amino acids are selected for protein synthesis by binding with transfer RNA (tRNA) in the cell cytoplasm. The information on the amino acid sequence of each individual protein is contained in the sequence of nucleotides in the messenger RNA (mRNA) molecules, which are synthesized in the nucleus from regions of DNA by the process of transcription. The mRNA molecules then interact with various tRNA molecules attached to specific amino acids in the cytoplasm to synthesize the specific protein by linking together individual amino acids; this process, known as translation, is regulated by amino acids (e.g., leucine), and hormones. Which specific proteins are expressed in any particular cell and the relative rates at which the different cellular proteins are synthesized, are determined by the relative abundances of the different mRNAs and the availability of specific tRNA-amino acid combinations, and hence by the rate of transcription and the stability of the messages. From a nutritional and metabolic point of view, it is important to recognize that protein synthesis is a continuing process that takes place in most cells of the body. In a steady state, when neither net growth nor protein loss is occurring, protein synthesis is balanced by an equal amount of protein degradation. The major consequence of inadequate protein intakes, or diets low or lacking in specific indispensable amino acids relative to other amino acids (often termed limiting amino acids), is a shift in this balance so that rates of synthesis of some body proteins decrease while protein degradation continues, thus providing an endogenous source of those amino acids most in need. /Protein synthesis/ The mechanism of intracellular protein degradation, by which protein is hydrolyzed to free amino acids, is more complex and is not as well characterized at the mechanistic level as that of synthesis. A wide variety of different enzymes that are capable of splitting peptide bonds are present in cells. However, the bulk of cellular proteolysis seems to be shared between two multienzyme systems: the lysosomal and proteasomal systems. The lysosome is a membrane-enclosed vesicle inside the cell that contains a variety of proteolytic enzymes and operates mostly at acid pH. Volumes of the cytoplasm are engulfed (autophagy) and are then subjected to the action of the protease enzymes at high concentration. This system is thought to be relatively unselective in most cases, although it can also degrade specific intracellular proteins. The system is highly regulated by hormones such as insulin and glucocorticoids, and by amino acids. The second system is the ATP-dependent ubiquitin-proteasome system, which is present in the cytoplasm. The first step is to join molecules of ubiquitin, a basic 76-amino acid peptide, to lysine residues in the target protein. Several enzymes are involved in this process, which selectively targets proteins for degradation by a second component, the proteasome. /Protein degradation/ Methionine dependence, the inability of cells to grow when the amino acid methionine is replaced in culture medium by its metabolic precursor homocysteine, is characteristic of many cancer cell lines and some tumors in situ. Most cell lines proliferate normally under these conditions. The methionine dependent t

Pharmacodynamics

L-Methionine is a principle supplier of sulfur which prevents disorders of the hair, skin and nails; helps lower cholesterol levels by increasing the liver's production of lecithin; reduces liver fat and protects the kidneys; a natural chelating agent for heavy metals; regulates the formation of ammonia and creates ammonia-free urine which reduces bladder irritation; influences hair follicles and promotes hair growth. L-methionine may protect against the toxic effects of hepatotoxins, such as acetaminophen. Methionine may have antioxidant activity.