Why Korean Skincare Loves This Ingredient, And Why You'd Swallow It

It started with the back of a Korean serum bottle.

I was reading an ingredient list, the way you do when you've bought too many serums. One name I kept seeing in Korean serums and creams was astaxanthin. A red antioxidant I had barely heard of.

Then I found people taking the same ingredient as a softgel. Not rubbing it on. Swallowing it.

My first thought was simple. Why would you swallow something you can put on your face?

The answer turned out to be the most useful thing I've learned about skincare in years.

Astaxanthin is a red pigment. It comes from a tiny microalgae, and it's the same pigment that turns salmon and shrimp pink.

What makes it special is its shape. Most antioxidants, like vitamin C and vitamin E, guard only one side of a cell wall. Astaxanthin can sit across the whole wall at once. [1][2] That gives it wider cover against the daily wear from sun and pollution.

That's why skincare brands want it in their formulas. But there are two ways to get it into your skin.

On your skin. A serum works where you put it: the top layers of your face. That's useful. But it stops there, and it only covers the spots you remember to reach.

From within. Taken by mouth, astaxanthin travels through your body and reaches skin cells from the inside. Your face, but also your neck, your chest and your hands. And every skin study I found for this article tested this swallowed form.

A 2021 review of 11 human studies found that taking astaxanthin by mouth clearly improved skin hydration and elasticity. [3] That's when I stopped asking if it works, and started asking which way in works best.

Once I knew I wanted the swallowed form, my question was simple. Which one can I actually trust?

This matters more than you'd think. In 2023, 64% of astaxanthin brands tested by an outside lab held less than 1mg, while their labels claimed up to 24mg.

That's how I ended up at Naiad. 12mg of astaxanthin per softgel. From Haematococcus pluvialis microalgae, the natural form used in the research. Held in MCT oil, because astaxanthin needs fat to absorb. Every batch is tested by an outside lab, and the report is available on request.

A quick test anyone can do: cut a softgel open. Real astaxanthin oil is dark red. If it's clear, it isn't the real thing.

I didn't want to write about my own face. One person's skin proves nothing.

So I looked at what a large group of users tend to report. Not cherry-picked quotes.

✓ A slow change, not a sudden one. Most people describe more comfort and less tightness first.

✓ A timeline that matches the studies. Little difference before week four. More reports of change by week six to eight.

✓ People who stopped, then started again, noticed the gap more clearly than they had noticed the change.

That last one got me. It's much harder to fake missing something than to talk yourself into a result.

Should I stop using my Korean serums? No. Keep them. The serum works on top. The softgel works from within. Together, they cover both ways in.

If it's already in my serum, why take it too? A serum only reaches the skin you put it on. The softgel reaches all of it, from the inside. And the skin studies in this article tested the swallowed form.

How long before I see anything? The studies measured changes at 6 to 8 weeks of daily use. Judging sooner just means judging early.

Will it change my skin tone? Some people who take high doses for a long time report a slightly warmer tone. It depends on the dose, it isn't universal, and it fades if you stop.

I'm allergic to shellfish. Is this safe? Naiad comes from microalgae, not shellfish. The risk with shrimp comes from shrimp protein, not from the pigment. Check with your doctor if you're unsure.

Is it safe? It's generally well tolerated across studies covering more than 2,000 people, some for up to a year. [4] Mild stomach upset is possible. If you take blood thinners or blood pressure medicine, or you're pregnant or breastfeeding, talk to your doctor first.

Here's something I only noticed after writing this. My routine stops at my jaw.

Most of us put serum on our face and forget the rest. The neck. The chest. The backs of the hands. That's often where skin shows the years first.

Taken from within, astaxanthin doesn't pick a spot. It reaches all of your skin the same way.

Hair and nails. One small trial paired astaxanthin taken by mouth with a scalp treatment, and counted 22.5% more full-grown hairs at 12 weeks. Early research, and it tested both together. For nails, there's no clinical study at all, only users mentioning stronger nails alongside their skin results.

None of this makes it a treatment for anything. It just means your face was never the whole story.

Sources

[1] Kidd P. Astaxanthin, cell membrane nutrient with diverse clinical benefits and anti-aging potential. Alternative Medicine Review. 2011;16(4):355-364. pubmed.ncbi.nlm.nih.gov/22214255

[2] McNulty HP, Byun J, Lockwood SF, Jacob RF, Mason RP. Differential effects of carotenoids on lipid peroxidation due to membrane interactions: X-ray diffraction analysis. Biochimica et Biophysica Acta. 2007;1768(1):167-174.

[3] Zhou X, Cao Q, Orfila C, Zhao J, Zhang L. Systematic Review and Meta-Analysis on the Effects of Astaxanthin on Human Skin Ageing. Nutrients. 2021;13(9):2917. doi.org/10.3390/nu13092917

[4] Brendler T, Williamson EM. Astaxanthin: How much is too much? A safety review. Phytotherapy Research. 2019. doi.org/10.1002/ptr.6514