Product Description
More Blood Flow Is the Cheat Code. Here's How to Prove It Works.
If you want to get fitter or go faster, there's one thing that always works: more blood flow. More blood means more oxygen. More oxygen means you can push harder before your body taps out. Real studies show a 4% or greater performance increase — and athletes who aren't yet at peak fitness can see up to 20%. This 5-day sample pack exists so you can find out exactly where you fall before committing to a full bottle.
SwissRX Nitric Oxide Pro is built on Noxa24, a patented blend featuring black garlic extract, that keeps your nitric oxide levels elevated for a full 24 hours with just two capsules a day.
What Makes It Different
24-Hour Coverage, Not a 2-Hour Window The original Nitric Oxide formula boosts NO production for 2–5 hours. The PRO formula reaches peak levels at 2 hours and holds them for a full 24 hours. Two capsules in the morning and you're covered all day — no re-dosing, no timing stress.
You Can Actually See It Working Three saliva test strips are included. Hold one under your tongue for 5 seconds before your first dose — that's your baseline. Test again after 60 minutes. In our testing, strips went from near-zero (off-white) to deep purple within two hours. Very few supplements let you watch them work in real time.
Multiple Pathways, One Goal Noxa24 activates several nitric oxide production pathways at once — including one that runs through your saliva, where nitrates interact with natural bacteria in your mouth to convert to NO. Skip the mouthwash while you're running this trial — you'll kill the bacteria you need.
Here's what more nitric oxide actually means during training: your arteries widen, oxygen-rich blood reaches working muscles faster, and you delay the point where lactic acid accumulates and your body starts to slow down. Your legs burn less at threshold. Recovery between hard efforts happens faster. You hold power longer before cracking — and in controlled interval testing, that translated to nearly 20 seconds per mile of improvement over two weeks.
How to Use It
1. Test your baseline first: Before your first capsule, use a test strip to establish your starting NO level.
2. Take two capsules every morning: Timing relative to your workout is flexible — it works for 24 hours, so consistency matters more than precision.
3. Retest at 60 minutes: Avoid fluids in that 60-minute window for the most accurate strip reading.
Dr. Kevin Sprouse, Head of Medicine for EF Education First Pro Cycling, recommends Nitric Oxide Pro not just for performance but for daily cardiovascular health, particularly for athletes over 50. Five days is enough time to feel it working. The test strips are there to prove it isn't a placebo.
This isn't a trial pack designed to get you hooked. It's five days of real-world testing with the data to back it up.
Supplement Facts
5-Day Sample Pack with 3 Test Strips
Serving Size: 2 Capsules
Serving Per Container: 5
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Vitamin C (as Magnesium & Zinc Ascorbate) 180mg | ** | |
| Vitamin D3 (as Cholecalciferol) 20mcg (800 IU) | ** | |
| Thiamine (as Thiamine Mononitrate) 80mg | ** | |
| Vitamin B12 (as Methylcobalamin) 100mcg | ** | |
| Magnesium (as Magnesium Ascorbate & Oxide) 126mg | ** | |
| Zinc (as Zinc Ascorbate) 5.5mg | ** | |
| Potassium (as Potassium Nitrate) 140mg | ** | |
| Proprietary Noxa24® Blend 700mg | ** | |
| Black garlic extract, beetroot extract, black currant extract, bilberry extract, raspberry extract, blue honeysuckle extract, blueberry extract | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
How to Test Your Nitric Oxide Levels
Take a Baseline Reading
Place a test strip on your tongue for 5 seconds. Fold it onto the test pad, hold for 10 seconds, then compare to the reference key.
Transfer the Sample
Fold the strip in half so the saliva-coated side presses against the test pad. Hold gently for 10 seconds, then separate and compare against the reference key.
Take SwissRX Nitric Oxide Pro
Take as directed and wait 60 minutes to give the supplement time to work
Retest and Compare Results
Use a second strip the same way as before, then compare your new result to the reference key to see the change in your nitric oxide levels.
SwissRX Nitric Oxide Pro Sample Pack FAQ's
Everything you need to know before getting started.
You get a 5-day supply of SwissRX Nitric Oxide Pro capsules plus 3 nitric oxide test strips. Use the first strip before you ever take a capsule to establish your baseline, the second strip 1–2 hours after your first dose to see the difference, and keep the third for a future check-in to confirm your levels are staying elevated.
Use strip one before taking Nitric Oxide Pro — this is your baseline. Take your two capsules, then use the second strip 1–2 hours later to compare. The third strip is your backup: use it anytime you want to reconfirm your NO levels are where they should be while on the product.
Take it daily, ideally 30–45 minutes before your training session. Nitric oxide support works best with consistent daily use rather than as a one-off, so use all 5 days back-to-back for an accurate read.
Nitric oxide signals your blood vessels to relax and widen — a process called vasodilation. More open vessels mean more blood, oxygen, and nutrients flowing to your muscles under load. For endurance athletes, that translates to better sustained output and faster recovery between hard efforts.
No. SwissRX Nitric Oxide Pro contains no caffeine and no stimulants of any kind. It's a vascular support supplement, not a traditional pre-workout. You can stack it with a caffeinated product or use it on its own.