In alternative medicine the following amino-acid is used for body building, immune system stimulation and for kidney stone prevention:

Question

BlackTom AI · Accepted Answer

Lysine is an essential amino acid required for protein synthesis, so it directly supports muscle growth and body-building by providing a necessary building block for new muscle protein. It also plays roles in immune function (supporting antibody production and collagen synthesis important for tissue repair) and has been used in alternative-medicine regimens aimed at reducing kidney-stone risk by influencing urinary calcium handling and reducing calcium-oxalate crystallization.

Relevant knowledge points and concepts:
- Essential vs nonessential amino acids: lysine cannot be synthesized by humans and must be obtained from the diet or supplements, making it a common target for supplementation.
- Protein synthesis and muscle anabolism: adequate lysine availability is necessary for forming muscle proteins, so supplemental lysine can support body-building efforts.
- Immune support: lysine contributes to immune competence through roles in antibody and collagen production and has been used to reduce viral recurrences (e.g., herpes) which reflects immune-modulatory effects.
- Kidney-stone prevention: clinical and alternative approaches use lysine supplements to alter urinary chemistry (reducing urinary calcium excretion and the tendency for calcium-oxalate crystallization), thereby lowering stone risk.

Step-by-step reasoning:
1. Identify candidate amino acids given in options.
2. Match each amino acid’s known clinical/alternative uses to the three targets: body-building, immune stimulation, kidney-stone prevention.
3. Recognize that lysine uniquely fits all three: essential for muscle protein formation (body building), associated with immune support, and used in formulations intended to reduce calcium-based kidney stones.
4. Exclude other options based on their primary roles.

Why the correct answer is correct:
Lysine’s essential role in protein synthesis explains its use in bodybuilding; its involvement in immune-related proteins and observed antiviral/immune effects explain its immune use; finally, lysine supplements have been applied to modify urinary chemistry to help prevent calcium stones.

Why other options are incorrect:
- Tyrosine: mainly a precursor for catecholamines/thyroid hormones and used for mood/cognitive indications, not typically for kidney stones or muscle building as a primary supplement.
- Alanine: nonessential, mainly involved in gluconeogenesis/energy metabolism, not a standard supplement for immune stimulation or stone prevention.
- Arginine: used for wound healing and vasodilation (NO production) and sometimes growth-hormone modulation, but it can exacerbate herpes and is not standard for kidney-stone prevention.
- Glutamic acid: an excitatory neurotransmitter and metabolic intermediate, not used for muscle building, immune stimulation, or stone prevention.

Conclusion: The correct answer is b. lysine, which matches the provided answer.

In alternative medicine the following amino-acid is used for body building, immune system stimulation and for kidney stone prevention:单项选择题

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