Supplements to “increase male performance “ will always include the following:

Question

BlackTom AI · Accepted Answer

Arginine is a precursor of nitric oxide (NO), which is the key mediator of vasodilation in penile and skeletal muscle blood flow, so L-arginine is the amino acid most commonly included in “male performance” supplements.

Relevant knowledge points and concepts:
- L-arginine is converted by nitric oxide synthase (NOS) into nitric oxide and citrulline: L-arginine → NO + L-citrulline (via NOS).
- NO diffuses into smooth muscle cells and activates soluble guanylate cyclase, converting GTP to cyclic GMP (GTP → cGMP).
- Increased cGMP leads to protein kinase G activation, reduced intracellular Ca2+ and smooth muscle relaxation, causing vasodilation and increased blood flow—critical for erectile function and enhanced delivery of oxygen/nutrients during exercise.
- Many “male performance” products target improved erectile function and exercise blood flow, so ingredients that boost NO (like arginine or citrulline) are logical inclusions.

Step-by-step reasoning:
1. Goal of such supplements: enhance erectile performance and/or exercise capacity via improved blood flow.
2. Biochemical route: L-arginine is the direct substrate for NOS → NO produced.
3. NO → stimulates guanylate cyclase → increases cGMP → smooth muscle relaxation → increased penile and muscular blood flow.
4. Therefore, including arginine in formulations directly supports the desired physiological effect.

Why the correct answer is correct:
- Arginine directly supplies substrate for NO synthesis, and clinical trials and supplement formulations commonly use it to improve erectile function and vasodilation.

Why the other options are incorrect:
- Alanine: involved in gluconeogenesis and energy metabolism, not a primary NO precursor for vasodilation.
- Glutamic acid: an excitatory neurotransmitter and precursor to GABA, not directly linked to NO-mediated vasodilation.
- Tyrosine: precursor to catecholamines (dopamine, norepinephrine), may affect mood/alertness but not typically used to increase NO or penile blood flow.
- Lysine: essential amino acid important for protein synthesis and collagen, not a NO precursor or common vasodilatory supplement for male performance.

Conclusion: The correct choice is d. arginine, which matches the provided answer.

Supplements to “increase male performance “ will always include the following:单项选择题

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