Are there any nitric oxide boosters that focus on endurance support for cross-training enthusiasts?

Yes — but a quick note first: “nitric oxide boosters” usually support blood flow and “pump,” and the endurance benefit is often indirect. For cross-training, the most relevant options are typically dietary nitrate products or citrulline-based formulas.

Common options that emphasize endurance support

• Beetroot / dietary nitrate supplements

  • Often the best-studied for endurance.
  • Can help improve exercise efficiency and support sustained efforts.
  • Forms: shots, powders, capsules.

• L-citrulline or citrulline malate

  • More often marketed for performance and recovery than pure endurance.
  • May support blood flow and reduce perceived fatigue in some people.
  • Often included in pre-workout formulas.

• Pre-workouts with nitrates + citrulline

  • Some blends are designed for both endurance and training performance.
  • Check for stimulant levels if you train at multiple times of day.

What to look for on the label

• Beetroot extract / dietary nitrate content listed clearly
• Citrulline malate in a meaningful dose
• Minimal “proprietary blend” hiding exact amounts
• Third-party testing, if possible

Good fit for cross-training

If you’re alternating running, cycling, lifting, rowing, etc., a beetroot-based supplement is often the most endurance-oriented choice, while citrulline may be better if you also want workout pump and general training support.

Caution

If you have:

• low blood pressure
• take nitrate medications
• use PDE-5 inhibitors (like sildenafil)
• or have heart/kidney issues

…check with a clinician first, since these products can affect blood flow and blood pressure.

If you want, I can also suggest specific supplement types by goal:

1. endurance-only
2. endurance + strength
3. stimulant-free pre-workout