Aleavia Prebiotic Body Cleanse

The polysaccharides do most of the work: they bind water at the skin surface for a light, non-greasy hydration boost. And one of the polysaccharides, glycomannan, is linked to fibroblast stimulation + collagen synthesis. This is also why aloe has such a long track record in wound and burn healing.

This ingredient is also calming with anti-inflammatory and mild antimicrobial activity, making it a great pick for sensitive, irritated, or post-sun skin.

Realistic expectations matter though; the solid evidence is mostly limited to hydration, soothing, and wound support. Deeper claims about anti-aging or sun protection are not well backed, and science reviews note it does not prevent radiation-induced skin injury.

Because it plays well with almost everything, it's commonly used as a base alongside other actives like niacinamide or vitamin C.

Typical usage concentrations range from 0.5% (where hydration benefits already show up) all the way to 90%+ (where it replaces water as the main base).

The safety for this ingredient is well-establish as well. Overall, this is a great supporting ingredient for those who want a boost in hydration.

Here's what the research shows:

In-vitro shows it calms inflammation signals; the most skin-relevant study put a kelp extract on human skin cells and then hit them with inflammatory triggers. The kelp-treated cells produced less of the inflammatory messenger molecules that normally get released.

In a realistic 3D model of skin, the pre-treated tissue held onto its cell-to-cell "seals" better and leaked less water (basically the lab version of a strong vs. weak skin barrier).

Two honest notes: the seal effect only showed up in the 3D model and at higher doses the extract started harming the cells (so more might not be better)

Fucoidan is why kelp gets talked about; it's the sulfated sugar molecule that brands like to name-drop. When four fucoidans were compared, the one from Macrocystis pyrifera was the most active. Just know this was from immune research and not skincare research.

On real people, the numbers look good (with an asterisk). The strongest evidence is all on Macrocystis Pyrifera Ferment inside one company's finished serum and not the plain extract.

Using it twice daily for eight weeks raised skin moisture 16 percent and cut water loss through the skin by 11 percent. A stripping test that repeatedly tapes and peels the skin surface found treated skin held up 30 percent better.

The standout result: half the face was prepped for three weeks and then the whole face got a 70 percent glycolic peel. The prepped side had recovered 71 percent of its barrier versus 23 percent untreated two hours later. A separate review also reported less visible redness and improvement in visible aging measures.

Three asterisk: It's the ferment, not the extract. The kelp isn't necessarily doing all the work since it's the whole formula. And it was funded by The Estée Lauder Companies with several authors on staff.

There's no fixed concentration published for this ingredient but real-world use survey shows this ingredient can be used up to 36%. There's an extra wrinkle for leave-on products since these extracts are usually supplier pre-diluted in water, glycerin, or propanediol.So "5%" on the bottle might mean under 1% for actual kelp solids.

On allergies: kelp is naturally iodine-rich, so people with a known iodine or seafood ingredient sensitivity should patch test.

You'll see algae listed as a 5/5 on a lot of pore-clogging charts and that number doesn't come from anywhere; it's not in the original rabbit-ear studies that most comedogenic ratings trace back to.

The reasoning behind the reputation is that seaweed is high in iodine and iodine can trigger acne-like breakouts when eaten. This traces back to a 1976 letter in Archives of Dermatology describing two women whose breakouts cleared after they stopped taking high-dose kelp supplements orally.

And the reaction of these two women wasn't clogged pores at all: it was an iodine-triggered pustular rash. Later research found normal dietary iodine doesn't meaningfully affect acne either and nobody has shown topical algae delivers enough iodine to matter.

What we do have is dozens of brown and red algae ingredients found to be non-irritating and non-sensitizing, and a handful of studies that found algae compounds may actually help acne.

However, plenty of people do report breaking out from algae-containing products. Skin is individual and it's worth avoiding if yours has reacted to algae before.

However, this exfoliating effect only happens at high concentrations (20%) which can be hard to find in cosmetic products.

Due to this, citric acid is usually included in small amounts as a pH adjuster. This helps keep products slightly more acidic and compatible with skin's natural pH.

In skincare formulas, citric acid can:

While it can provide some skin benefits, research shows lactic acid and glycolic acid are generally more effective and less irritating exfoliants.

Most citric acid used in skincare today is made by fermenting sugars (usually from molasses). This synthetic version is identical to the natural citrus form but easier to stabilize and use in formulations.

Rosacea skin has a lower threshold for acids generally, with 62.5% of rosacea subjects in one study reacting to lactic acid in a sting test. This is why we mark citric acid as a potential rosacea trigger.

However, this ingredient shows up as a pH adjuster or chelator at roughly 0.1-1% in many products. These low levels are unlikely to be an issue for rosacea skin and becomes a potential trigger at exfoliating concentrations (20%). Because everybody's skin is unique, we recommend a patch test if you are unsure.

Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.

Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.

This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.

Just know very high concentrations (>40%) can feel tacky in low humidity.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.