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on 9/29/18The closest thing to TruNiagen is Elysiums BASIS and you can see the comparison here https://www.right-of-assembly.org/single-post/2018/04/14/Elysium-Basis-or-ChromaDex-Niagen----Which-Is-Best
Tru Niagen has a few good rivals like Life Extension NAD, and GENEX and I found a list of comparisons here https://www.biohackerslab.com/reviews/best-nicotinamide-riboside-supplement/