Almost every skincare active is dose-dependent: below a certain level it simply does not do enough to matter. That is what makes an ingredient list so easy to game. A brand can add a famous ingredient at a fraction of a percent, print it prominently, and deliver almost none of its benefit - the practice known as fairy-dusting.

We formulate to the concentrations used in clinical studies, not the trace that photographs well on a label. You can see the exact strength of every active on our product specifications page.

Every active has a narrow pH window where it stays stable and can actually enter the skin. Pure vitamin C (L-ascorbic acid) is only well absorbed below about pH 3.5; its gentler salt forms work best near pH 6.3; exfoliating acids act at pH 3.2 to 3.5; most peptides and retinoids want to sit near neutral.

Formulate the same active at the wrong pH and it is quietly wasted, no matter how much is in the bottle - or it turns needlessly harsh. Every NuFountain formula is built to the pH its chemistry requires.

An active only helps if it reaches living skin, and the base it travels in decides whether it gets there. Heavy oils, waxes, and silicones can trap actives on the surface or block them from absorbing.

We carry ours in a fast-absorbing, water-light base with plant-derived penetration helpers - propanediol and dimethyl isosorbide - that move actives in and disappear without residue, and we leave out the comedogenic oils and silicones that would slow them down.

The most powerful actives are also the most fragile. High-dose vitamin C, copper peptides, retinoids, and green tea extract all oxidise or break down over months on a shelf, so a bottle that spent half a year in a warehouse can reach you at a fraction of its labelled strength - often the real reason a vitamin C serum has turned yellow.

We make each batch to order in amber glass and keep it cold, so the active you pay for is the active you apply.

For us it is a performance decision before it is an ethical one. Filler ingredients - silicones, PEGs, heavy waxes, cheap thickeners - do not simply add nothing; they take up space in the formula and can dull how well the actives absorb.

We hold every product to a defined list of exclusions and check all 22 formulas against it, which returns zero banned ingredients. The full list, and the reason behind each exclusion, is on the blacklist.

Yes, and it is among the most-studied ingredients in all of skincare. It is a potent antioxidant that neutralises the free radicals behind visible ageing, an essential cofactor your skin uses to build collagen, and an inhibitor of excess pigment - which is why it both firms and brightens the look of skin over time.

Pure L-ascorbic acid is the most direct and best-researched form, effective at roughly 10 to 20%, but it demands a low pH and is famously unstable. Gentler derivatives - magnesium and sodium ascorbyl phosphate, ethyl ascorbic acid - trade a little raw power for stability and comfort at a skin-friendly pH. We build both routes: see the L-ascorbic acid serums and the gentler vitamin C derivative serums.

Retinoids are the most evidence-backed anti-ageing actives there are: they accelerate skin-cell turnover and signal collagen production, softening the look of lines and refining texture. The catch is that traditional retinol must convert through two steps in the skin, which is what drives its redness and peeling.

We use hydroxypinacolone retinoate (HPR), a next-generation ester that binds skin receptors directly - retinoid results with far less irritation. Bakuchiol is the one botanical shown in studies to switch on similar retinoid-like gene activity, and it is gentle enough for reactive and pregnant skin. Both live in the vitality serums.

Niacinamide (vitamin B3) is one of the most versatile and best-tolerated actives available. It supports the skin barrier by helping it make its own ceramides, moderates excess oil, evens the look of tone by interrupting pigment transfer, and calms visible redness - all at a neutral, non-stinging pH.

Its benefits are well documented in roughly the 2 to 5% range; more is not better, and very high levels add no extra reward. We dose it where it earns its place rather than as a headline number.

Peptides are messengers, not fillers: short chains of amino acids that tell the skin to do something. Signal peptides such as Matrixyl prompt fresh collagen; copper peptides (GHK-Cu) support repair and elastin; neuropeptides such as Argireline ease the muscle contractions behind expression lines.

The evidence is genuinely promising, though the effect is gentler and slower than a retinoid and depends heavily on using a real, undiluted dose rather than a trace. We formulate pure peptide at clinical levels - see the firming options in the vitality serums.

Alpha-hydroxy acids - glycolic, lactic, mandelic - dissolve the bonds holding dull, dead cells to the surface, revealing smoother texture and a brighter, more even tone. Salicylic acid, a beta-hydroxy acid, is oil-soluble, so it slips into the pore itself to clear the congestion behind blackheads.

Used at a sensible strength and a buffered pH they are safe for regular use; the real risk is over-exfoliation, which strips and inflames the barrier. We buffer and dose ours to resurface without the burn of a legacy peel. Most live in the vitality serums.

Hyaluronic acid is a humectant: a molecule that binds water, each gram holding up to a thousand times its weight. Molecular weight decides where it works - high weight sits near the surface for immediate plumping, low weight travels deeper.

The best results come from combining grades and, importantly, sealing them in, because in very dry air a humectant left exposed can pull moisture out of the skin rather than into it. We layer multiple weights with botanical water-binders like snow mushroom and beta-glucan across the hydration serums.

Antioxidants work as a network, not as soloists. Vitamin C, vitamin E, and ferulic acid regenerate one another and cover different kinds of free-radical damage - together they roughly double the photoprotection either vitamin gives alone. A single antioxidant, by contrast, is quickly spent.

It is why our most advanced formulas layer complementary defenders - vitamin C with E, ferulic acid, and green tea or phloretin - rather than leaning on one hero ingredient. The vitamin C serums are built around exactly this pairing.

The skin barrier is built from a balanced blend of ceramides, fatty acids, and cholesterol; when that blend is depleted, skin feels tight, looks dull, and loses water. Replacing those exact lipids with skin-identical versions - ceramide NP, sugarcane squalane, and plant phytosterols in place of animal cholesterol - rebuilds the barrier from its own materials, which research finds more effective than simply sitting an occlusive like petrolatum on top.

Our barrier work centres on this full lipid trio; the hydration serums are where to find it.

Yes, though the simplest approach is to separate them by time of day: vitamin C in the morning, where its antioxidant protection pairs naturally with daytime sun exposure, and a retinoid at night, when skin repairs. Using both at once is not dangerous, but reactive skin may find the combination a lot at first.

Our full layering guidance is on the product synergy page.

The general rule is thinnest to thickest, letting each water-light layer absorb before the next. Because our serums are all water-light and fast-absorbing, they layer easily; the main judgement calls are around combining strong actives.

We map out the exact order for every routine on the product synergy page.

It depends on the job. Hydration and a smoother, more radiant surface can look different within days. Brightening and fading the look of dark spots usually take four to twelve weeks. Collagen-related firming from retinoids and peptides is the slowest, often three to six months of consistent use - which is exactly why a stable, full-strength formula matters over that timeframe.

Fragrance - including natural, essential-oil-based fragrance - is one of the most common causes of skincare irritation and contact allergy, and it offers your skin no benefit. We leave it out of every formula entirely. The botanical extracts in our serums, like green tea and centella, are there as actives, not as scent.

Not automatically - natural and synthetic both include gentle ingredients and harsh ones, and poison ivy is natural too. Our exclusions are based on evidence and tolerance, not on whether an ingredient came from a plant or a lab: we choose the safest, best-performing version of each material, which is sometimes botanical and sometimes precisely engineered.

The reasoning behind every ingredient is laid out on our ingredients page.

Colour change means the vitamin C is oxidising - reacting with air, light, and time, and losing potency as it does. A serum that arrives already tinted has usually spent months on a shelf.

It is the single reason we make our vitamin C to order in amber glass and keep it cold: you get it at the start of its life, not the end.

Much of the line is formulated with reactive skin in mind - gentle vitamin C salts, buffered acids, and soothing agents paired with every strong active. Pregnancy is more specific: it typically rules out retinoids, which is exactly where a botanical like bakuchiol fits.

Because individual circumstances vary, anyone pregnant or managing a diagnosed skin condition should confirm a routine with their own doctor or dermatologist.

It genuinely helps. Cold slows the oxidation that degrades fragile actives like vitamin C, copper peptides, and retinoids, extending the window in which your serum performs at full strength.

Since our formulas are made fresh and free of the heavy preservative systems that mask ageing, refrigeration is the simplest way to protect what you have.