Red spinach has carved out a space in the health and sports nutrition worlds as a natural source of dietary nitrate. If you've looked into VitaSpinach®, RS400®, and Oxystorm® red spinach extract or shopped around for red spinach supplements, you've probably noticed that not all products are built the same way.
VitaSpinach® and RS400® are finished products designed for direct consumer use. They use a clinically studied red spinach (amaranthus) extract, but differ in serving strength and intended use.
Understanding these differences helps you choose what fits your goals. Some athletes need precise, repeatable doses. Others prefer all-in-one formulas. Neither approach is wrong.
What VitaSpinach® Red Spinach Extract Is
VitaSpinach® is a NutriGardens® clinically studied, single-ingredient red spinach (amaranth) extract (see studies here: Samford University and the University of Alabama at Birmingham (UAB)). It is a ready-to-consume red spinach extract powder from the leaves of the amaranthus plant. It is made for direct consumer use and contains only red spinach extract, with no added ingredients, fillers, flavours, or blends.
Each serving is standardized to deliver 240 mg of dietary nitrate, verified by Certificate of Analysis (COA), making it well-suited for consistent daily intake.
What RS400® Red Spinach Extract Is
RS400® is a higher-strength finished red spinach extract made using VitaSpinach® but designed for individuals who require higher targeted nitrate intake, particularly athletes and those training at higher intensities. Each serving is standardized to deliver 400 mg of dietary nitrate.
What Oxystorm® Red Spinach Extract Is
Oxystorm® is a branded red spinach extract ingredient. As with any red spinach supplement, it’s helpful to check the label for the per-serving amount and choose the format that best fits your routine and target intake. In blended formulas, the amount of red spinach extract per serving can vary by product, so it’s worth checking how it aligns with your target intake. This is common across the supplement industry, where formulas are designed to combine multiple ingredients into a single serving based on the manufacturer’s intended use.
Clean and Oxalate-Free
Both VitaSpinach® and RS400® have been tested and confirmed as oxalate-free.
Here are the actual oxalate test results of VitaSpinach® and RS400® red spinach extract:
VitaSpinach® vs RS400® vs Oxystorm®: Which Red Spinach Extract Supplement Fits Your Goals
VitaSpinach® and RS400® are bulk powders that can be mixed into water, which may increase oral and salivary exposure compared to formats swallowed quickly.
Oxystorm® is a branded red spinach extract ingredient. Because the nitrate pathway involves saliva and oral bacteria, formats that dissolve and mix in the mouth may support the early step more directly than formats that are swallowed quickly.
Dietary nitrate supports nitric oxide (NO) signaling through the entero-salivary nitrate-nitrite pathway: nitrate is absorbed, concentrated into saliva, and then reduced to nitrite by naturally occurring oral bacteria before being swallowed. Because this process involves saliva and the oral microbiome, delivery formats that dissolve and mix in the mouth (such as powders or liquids) may support this early step more directly than formats that are swallowed quickly, like capsules.
VitaSpinach®, RS400®, and Oxystorm® are registered trademarks of their respective owners. Trademarks are used for identification and comparison only and do not imply endorsement or affiliation.
NutriGardens publishes ingredient science and educational research on this site to make nutrition science clearer and more accessible. Learn more at: NutriGardens.com.
