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L-arginine is the direct substrate for nitric oxide synthase (NOS), the enzyme that produces NO

Option (Evidence Strength: Grades B, B, C, and B) Amitriptyline (Evidence Strength: Grade B ) One randomized controlled trial reported efficacy of oral amitriptyline (25 mg daily titrated over several weeks to 100 mg daily if tolerated) to be superior to placebo (63% of treatment group clinically significantly improved compared to 4% of placebo group) at four months

While green tea may have benefits, a closer look at this study suggests the news was exaggerated and misleading

Professional providers carefully evaluate: Your health history Current vitamin levels Appropriate dosage Frequency of treatment the benefits of B12 without the risk of overdose

Use a fresh, sterile syringe for each transfer and dispose of needles in a sharps container immediately after use