The SCIENCE of L-Arginine & L-Citrulline for ED (+ What to Do Instead When Supplements Don't Work!)

22 Jul 2025 · 7 min
6:57

This German-language transcript (single-speaker YouTube video by Anne Truong MD) explains why oral L-Arginine and L-Citrulline supplements often fail to raise nitric oxide (NO) levels: extensive first-pass metabolism in the gut/liver and dysfunction or saturation of the NO-synthase (NOS) enzyme. The speaker claims NOS depends on many cofactors and may be ~50% nonfunctional by age ~40. She warns excess arginine/citrulline can worsen inflammation and reduce blood flow. Alternatives offered include dietary NO (arugula/rucola extract capsules sold in the speaker's shop), paced nasal breathing (inhale 4 counts, exhale 6 counts), strength or HIIT exercise, and avoiding fluoride-containing mouthwashes and excess antacids. The talk closes with product/course promotions (NO capsules, "Get Wood Now" course, "Modernman Club").

Questions this video answers

Around 40 years of age.

Inhale through the nose for 4 counts, exhale for 6 counts.

Chapters

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