Most NMN products add a second ingredient. The two most common are trans-resveratrol and pterostilbene.
Both compounds belong to the stilbenoid family of polyphenols, the same broad group that includes the resveratrol found in grapes and berries. Pterostilbene is structurally a methylated form of resveratrol. In supplements, both are commonly added alongside NMN as a second ingredient rather than used on their own. Because they are different molecules, products choose one or the other, and the labeled amount varies by product. The practical point for buyers is simple: know which one a product uses, and how much of it is on the label.
| Point | Trans-resveratrol | Pterostilbene |
|---|---|---|
| Family | Stilbenoid polyphenol | Stilbenoid polyphenol (methylated relative of resveratrol) |
| How it appears here | Used by some other NMN formulations | The second ingredient in both Rejuvecore and Rokit America |
| Role in NMN products | Second ingredient paired with NMN | Second ingredient paired with NMN |
| Example product | Various other NMN products | Rejuvecore (250mg + quercetin) · Rokit America (250mg) |
General ingredient comparison. Amounts reflect each product's labeled spec; this is not a claim of effect.
Looking at real products makes the point concrete. Both of these NMN products use pterostilbene rather than trans-resveratrol. Rejuvecore NMN 99.9 Pterostilbene is a capsule that lists 250mg of NMN with 250mg of pterostilbene plus quercetin per daily serving, with NMN purity tested by Koptri (HPLC-DAD, 99.989%/99.90%), pterostilbene at 98% from Certified Laboratories, and Korean GLP toxicity testing (single-dose and 90-day). Rokit America NMN Pterostilbene lists 250mg of NMN with 250mg of pterostilbene per daily 2-capsule serving, with NMN purity tested by Koptri (HPLC-DAD, 99.90-99.91%), GLP toxicity testing (5 studies), heavy metals not detected, and cGMP, FDA Registered, and NSF certification. Trans-resveratrol, by contrast, appears in various other NMN formulations rather than in these two.
The second ingredient is one factor, not the whole decision. Start with the NMN dose, since that is usually the headline reason for buying. Then look at which second ingredient the product uses and how much is listed, followed by purity testing, certification, and a clear official seller. A product is not automatically better because it uses one stilbenoid over the other; what you can verify — the labeled amounts and the testing behind them — is the more useful basis for comparison than any claim about the ingredient itself.
Both are stilbenoid polyphenols often paired with NMN. Pterostilbene is a methylated relative of resveratrol. They differ in chemical structure and are used as different second ingredients. Neither guarantees a specific outcome.
Both Rejuvecore and Rokit America pair NMN with pterostilbene. Rejuvecore lists NMN 250mg with pterostilbene 250mg plus quercetin, and Rokit America lists NMN 250mg with pterostilbene 250mg. Trans-resveratrol appears in various other NMN products.
It is one factor among several. Confirm the NMN dose first, then look at the second ingredient, its labeled amount, purity testing, and certification.
This article is general information to help compare products. It does not claim any health effect. If you have a health condition or take medication, consult a professional before use.