TL;DR
Niacinamide is one of the best-studied actives in skincare. It is also the wrong ingredient for a postbiotic-led microbiome serum. We left it out of the Microbiome Glow Serum on purpose, and the decision was about stack discipline, not skepticism.
This piece is going to disappoint anyone hoping for a takedown of niacinamide. There isn’t one. Niacinamide works. It is one of the rare actives where the literature, the dermatologist consensus, and consumer outcomes all point in the same direction.
We still left it out. Here is why.
What niacinamide does
Topical vitamin B3. At 2 to 5 percent, niacinamide reduces transepidermal water loss, improves barrier function, supports ceramide synthesis, and visibly reduces redness and post-inflammatory hyperpigmentation. The four-week effect is one of the most replicable findings in cosmetic dermatology.
It is also affordable, stable, well-tolerated, and pairs with most other actives. The marketing label “hero ingredient” actually fits in this case. That is rare.
So why isn’t it in the Microbiome Glow Serum?
Two reasons, both about what the serum is for.
The first is mechanism overlap. Niacinamide and our postbiotic ferment system are both, in different ways, targeting barrier function and microbial balance. Niacinamide does it through nicotinamide-driven ceramide synthesis. The postbiotic ferment does it by feeding the existing microbial population and providing metabolites the skin recognizes. Putting both in one serum at full clinical concentrations doesn’t add. It muddles. When the mechanisms are similar, the data on what’s working becomes harder to read.
The second is product positioning. A serum that tries to do everything ends up doing each thing less convincingly. The Microbiome Glow Serum is a postbiotic-first product. That is the story it tells. That is the formula we built. Niacinamide belongs in a different product, where it can be the lead actor with the formulation built around it.
The contrarian view
The marketing wisdom in beauty right now is that more named actives equals more value. A serum with niacinamide plus postbiotics plus peptides plus vitamin C plus hyaluronic acid reads as “complete.” We disagree. We think that reads as “unconfident.” The brands writing the most-loaded ingredient lists are usually the ones trying to hedge against any individual ingredient being too dilute to perform.
Our serum has five actives, each at a meaningful concentration, with mechanisms that don’t redundantly compete. That is a deliberate position. Some readers will prefer the multi-active approach. The disagreement is fair, and we are not going to pretend otherwise.
Where niacinamide will live
In our wider future range, in a product where it is the lead. That product is in formulation testing as we write this; we will not commit to a launch date because we don’t yet trust the timeline. When it arrives, it will be 5 percent niacinamide as the headline, paired with zinc PCA and a small fraction of tranexamic acid, in a separate serum or essence format. Different routine slot. Different problem to solve.
If your skin would benefit from both postbiotic support and niacinamide, the answer is to layer two products, not to expect one to do both well. AM and PM routine slots give you room for that without crowding the same step.
What this means for the user
If you came to the Microbiome Glow Serum looking for niacinamide, it isn’t here, and we wanted you to know that before you opened the box. The product page lists actives in order of concentration. Reading the INCI list of any product is a useful skill, and we have a guide for it.
What is in the serum: a postbiotic ferment complex, fermented galactomyces filtrate, snow mushroom polysaccharides, panthenol, and a low-percentage centella extract. Five actives. None of them niacinamide. All of them doing different things.
Where this fits in our wider thinking
Stack discipline is the principle that guides our whole formulation philosophy. The slow skincare argument we have made elsewhere says fewer products, used longer, with deliberate purpose. Stack discipline is the same idea inside a single bottle. Each ingredient has a job. No ingredient is there for the ingredient list. No ingredient is there to hedge.
If we ever add niacinamide to this serum, it will be because we were wrong about the mechanism overlap. We don’t expect to be.
FAQ
Is niacinamide bad for the microbiome? Not as far as the current literature suggests. We left it out for stack reasons, not safety reasons.
Can I use a niacinamide serum on top of the Microbiome Glow Serum? Yes. Apply the postbiotic serum first, let it absorb, then layer niacinamide if you want both.
Why are you so picky about ingredient stacking? Because adding ingredients is easy and subtracting them is hard. We try to start from a clean architecture.
When will the niacinamide product launch? We are not committing to a date. We will announce it when the stability and clinical data are where we want them.
Will niacinamide ever go into the Glow Serum? Unlikely. The mechanism overlap argument is the load-bearing part of the decision.
Explore the postbiotics tag hub for more on this category.
Sources
- Bissett et al., “Niacinamide: a B vitamin that improves aging facial skin appearance,” PubMed
- American Academy of Dermatology, skin care basics and ingredient guidance
- Lopes et al., “Postbiotics in skin health,” NIH/PMC review