Recently seen topical niacin/niacinamide. Haven't expected that it's so widespread. Mostly used to solve skin disorders and ageing issues. The prob is it's mostly available as niacinamide. The type of B3 vitamin that doesn't produce flush compare to niacin. That's bad. As the flush is the point.
Meanwhile, there are some products containing specifically niacin - Niacin/Liquide (10mg/1ml), Niacin/Powder (pure) and Niacin based creams (seems, at low concentration).
What's interesting is how easy to deliver niacin and what concentration could be optimal. For example, here is the "side" ingredients for Ordinamiry niacinamide/zinc product: "Water, Niacinamide, Pentylene Glycol, Zinc PCA, Tamarindus Indica Seed Gum, Xanthan Gum, Isoceteth-20, Ethoxydiglycol, Phenoxyethanol, Chlorphenesin." Which of them work as a vehicle? And could they be used a vehicle for niacin instead of niacinamide? Ideally, would be nice to force the company to produce similar product based on niacin too.