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Ingredient science.
Written in Jefferson City.

FeaturedIngredient Science

UV Through Windows: What Your Commute Is Doing to Your Skin

Window glass blocks the UV that burns you — and waves through most of the UV that ages you. The science of UVA transmission through car, office, and home glass, and what it means for anyone who thinks 'indoors' means 'protected.'

July 11, 2026 · 8 min

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Ingredient Science

Argan vs. Rosehip vs. Jojoba: An Honest Comparison of Face Oils

Three oils dominate every 'best face oil' list, and they are genuinely different products — different chemistry, different jobs, different skin types. Here is the comparison the roundup articles won't give you, including when argan is NOT the right pick.

9 min read

July 10, 2026

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Ingredient Science

Why Sunscreen Feels Greasy — and What Formulators Do About It

The greasy film, the white cast, the shine at 10 am — none of it is accidental. It comes from specific formulation choices, and understanding them tells you exactly what to look for in a sunscreen you'll actually wear.

8 min read

July 7, 2026

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Ingredient Science

Argan Oil for Oily and Acne-Prone Skin: Why an Oil Can Calm Oil

Putting oil on oily skin sounds like the worst possible idea. But oily skin is often skin that overproduces sebum because its barrier is stripped — and the fatty acid profile of argan oil addresses exactly that. Here is the mechanism, honestly explained.

8 min read

July 7, 2026

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How to Use

How Much Sunscreen Do You Actually Need? (Most People Apply Half)

The SPF number on the label was measured at 2 milligrams per square centimeter of skin. Almost nobody applies that much. Here is what the standard actually looks like in real life — and what under-applying does to the protection you think you have.

7 min read

July 5, 2026

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Ingredient Science

Why SPF 50 and Not SPF 30: The Math Behind the Difference

SPF 50 and SPF 30 both sound protective. The difference is one percentage point. But the UV that reaches your skin at SPF 30 is roughly a third more than at SPF 50 — and over time, that gap accumulates.

9 min read

May 19, 2026

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How to Use

The Correct Order for Argan Oil and Sunscreen — and Why It Matters

If you use both argan oil and a separate sunscreen, the order you apply them changes how well the SPF actually works. Here is the right sequence, and the reason behind it.

7 min read

May 12, 2026

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Ingredient Science

What Cold-Pressed Actually Means — and Why Argan Oil Quality Varies So Much

"Cold-pressed" appears on a lot of argan oil labels. The temperature threshold that defines it — and what happens to the oil above that threshold — explains why two bottles with the same label can be completely different products.

9 min read

May 5, 2026

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Our Process

How We Make ArrowFox in Jefferson City

Small batch is not a marketing term. Here is what it actually means for how we work — and why it matters for what ends up in your bottle.

4 min read

April 28, 2026

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New articles regularly — ingredient science, process notes, and how-to guides.