So for Pterostilbene, I used a German brand Hepatica which seems to have a good reputation. (I live next to Germany.) Spermidine is so cheap and easy to manufa

So for Pterostilbene, I used a German brand Hepatica which seems to have a good reputation. (I live next to Germany.) Spermidine is so cheap and easy to manufacture that I doubt that there are fake products out there; yet another German company (Green Naturals.) As for NR, I chose Tru Niagen (ChromaDex), a well-known brand. It is expensive, though. By far the most expensive of the three supplements.