Since alchemy is a big deal in The Elder Scrolls 4: Oblivion Remastered, finding exotic ingredients is important as well! The thing about some of these ingredients, like the infamous Glow Dust, is that they drop from very specific enemies that won't spawn until you're well into the mid-game progression levels.
To that end, you won't be able to get Glow Dust reliably in Oblivion Remastered until you're at least level 9, but optimally level 11. Why that is the case and how to occasionally get around these requirements, we'll explain below.
Glow Dust is a unique monster drop in The Elder Scrolls 4: Oblivion and Oblivion Remastered. It is dropped exclusively by the Will-o-the-Wisp, which isn't commonly found until you've reached character level 11 or above. They will sometimes spawn as boss-tier encounters from level 9 onwards, however, which makes Glow Dust slightly more attainable even earlier than level 11.
After reaching level 11, Will-o-the-Wisps will begin to spawn outdoors in swampy areas, which will make Glow Dust relatively easy to get from that point on. Before that, the only way to get Glow Dust is to grab it from bespoke spawn locations, or to hunt down quest-specific Will-o-the-Wisp spawns, which is obviously less than ideal. Glow Dust is thus very rare early on in Oblivion Remastered. Here are all reliable the spots where you can grab some Glow Dust before you're level 9:
Further, you'll be able to fight three Will-o-the-Wisps at Azura's Shrine and the Swampy Cave, but they will only spawn after the Blood of the Daedra and the Mystery at Harlun's Watch quests have been started, respectively.
All of this is to say that you won't have reliable access to Glow Dust in Oblivion Remastered until you've reached level 9 at least, which is also when the resource will begin to spawn as part of randomized Monster Loot chests.
How do you not see it? It’s glowing!