01
Barrier first.
Support hydration, comfort, and resilience before asking stressed skin to tolerate more correction.
Founder + Formulator
Jen Valenti
Jen Valenti is the founder and formulator of Alchemy 21/12. She develops every formula around a barrier-first framework shaped by hands-on formulation work and lived experience with changing, reactive skin.
Alchemy 21/12 grew from a simple question: what changes when skin stops behaving the way it always has? The answer became a formulation philosophy built around hydration, comfort, barrier resilience, and targeted signaling rather than aggressive correction.
Jen is not a dermatologist or physician. Her work is cosmetic formulation and skin education, not medical advice.
Jen Valenti · Founder + Formulator
Why I Built Alchemy 21/12
My skin changed, but my products didn't change with it.
Perimenopause changed my skin before I fully understood what was happening. Products I had used for years suddenly felt wrong. More actives weren’t the answer. Neither was treating sensitivity as a permanent skin type.
I started looking at the problem differently. Instead of asking whether skin was dry, oily, sensitive, or mature, I became interested in what my barrier was actually doing: how well it was holding water, how much irritation it could tolerate, how quickly it recovered, and when it was ready for correction again.
That became the foundation of Alchemy 21/12. Over three years, I developed the line from raw materials, bench-testing formulas around a simple principle: support the conditions skin needs before asking more from it.
The result is a barrier-first system built around four functions: Hydrate. Calm. Strengthen. Signal. That is The Alchemy Method, designed for skin that changes across hormones, age, environment, stress, treatment history, and life.
Perimenopause is a barrier event. Once I understood that, the way I formulated changed completely.
Jen Valenti · Founder + Formulator
How I Formulate
The formula is the system.
I don't formulate around a single hero ingredient. Dose, compatibility, pH, texture, stability, preservation, and the condition of the skin all determine what an ingredient can actually contribute.
02
Dose matters.
More is not automatically better. Concentration has to make sense inside the finished formula and for the way the product is actually used.
03
Compatibility is part of efficacy.
An active only earns its place if the pH, delivery system, preservation strategy, and surrounding materials allow it to remain useful.
04
The finished formula wins.
Ingredients are not products. Texture, stability, sensory performance, order of use, and repeatability determine whether a formula actually belongs in a routine.
The Intentional Choices
Nothing is incidental.
The experience of a formula matters to me as much as what is inside it. Texture, scent, packaging, application, storage, and the way a product fits into a routine are all formulation decisions.
How it smells matters.
I use restrained sensory cues intentionally. When scent appears, it belongs to the experience of the formula rather than functioning as decoration.
How it moves matters.
Slip, cushion, spread, absorption, drydown, and residue all influence whether a formula feels effortless enough to become part of a routine.
The package is part of the formula.
Airless systems, opaque materials, refrigeration, pump behavior, and dose control are selected around what the formula needs, not simply how the package looks.
How it is used matters.
A product has to make sense in sequence. Order of application, frequency, compatibility, and the way products interact are part of the finished experience.
A formula should feel considered before you ever read the ingredient list.
Formulation development · Alchemy 21/12
At the Bench
Built from raw materials forward.
Every Alchemy 21/12 formula begins at the bench. I work through the complete system — raw materials, concentration, pH, compatibility, sensory performance, preservation, packaging, and repeat use.
01
Start with the material.
Understand what the raw material actually is, how it behaves, what environment it needs, and whether it has a meaningful role in the finished formula.
02
Build the system around it.
Concentration, pH, solvents, emulsifiers, rheology, preservation, and supporting ingredients are designed together rather than added as independent decisions.
03
Bench. Adjust. Bench again.
Spread, foam, cushion, absorption, residue, compatibility, and stability are observed through repeated iterations until the formula behaves the way it was intended to.
04
Then choose the vessel.
Packaging is selected around dose control, air and light exposure, storage, viscosity, stability, and the physical behavior of the finished formula.
Areas of Focus
The questions I keep coming back to.
My formulation work concentrates on the places where skin biology, ingredient chemistry, and the realities of daily use intersect.
01
Barrier-focused formulation
How hydration, lipid support, cleansing, irritation load, and recovery influence what skin can comfortably tolerate next.
02
Copper peptides
GHK-Cu and AHK-Cu, including concentration, formulation environment, stability, packaging, and how copper peptide systems differ between skin and scalp applications.
03
PDRN + biotechnology
Plant-derived Sodium DNA, complementary signaling technologies, and how newer biotechnology can be integrated into formulas without losing sight of stability or skin comfort.
04
Peptide systems
Using peptides as coordinated systems rather than decorative label additions, with attention to dose, compatibility, and the role each peptide is intended to play.
05
Changing + reactive skin
Formulating for skin whose tolerance, hydration, and recovery can shift with hormones, age, climate, stress, treatment history, and life.
The goal is not to chase every new ingredient. It is to understand a smaller number of systems deeply enough to use them well.
Now · Soon · Later
Change isn't linear.
Some changes can be seen or felt quickly. Others emerge through consistent use. And in between, skin can look less predictable from one day to the next.
01
Now
First application → Day 7
You can feel the difference.
Hydration, softness, cushion and surface smoothness can change quickly. Glow here is largely about water, surface optics and comfort.
02
Early
Days 7–14
The benefits begin to hold.
The first meaningful shift may be how skin behaves between applications: hydration feels steadier, comfort lasts longer and good-skin days become easier to reproduce.
03
Variable
Weeks 2–4
Progress may look messy.
Texture and luminosity can fluctuate while normal skin cycling continues. One duller morning or a few rougher-feeling days do not define the direction of your routine. Watch the trend, not a single day.
04
Soon
Weeks 4–8
Consistency replaces novelty.
Smoothness, luminosity, clarity and hydration may begin to look less like isolated good days and more like recurring characteristics of the skin.
05
Later
8–12+ weeks
The baseline moves.
Longer-horizon corrective benefits have had time to accumulate. Fine lines look softer, texture smoother, tone and clarity more even, and skin more luminous, firm-looking and resilient.
This is where improvement stops feeling like a string of good-skin days and starts becoming the way your skin looks more often.
The goal isn't a better good day. It's a better baseline.
Research context
This timeline is not a promise that every routine follows the same schedule, and temporary roughness or irritation should not be treated as proof that a product is working. Skin naturally fluctuates, while hydration, barrier support and longer-horizon cosmetic benefits operate on different time scales.
Published Work
Notes from the work.
Writing on formulation, skin biology, ingredient chemistry, and the decisions behind Alchemy 21/12.
You Can’t Unburn the Toast
A lab just reversed a hallmark of aging in donated human skin. You cannot buy it. Here is what the research actually showed, why the sugar story is...
Read article