Astaxanthin or CoQ10, which should you take?

They do different jobs, so this is not really a swap. The more useful thing they share is that both are fat-soluble, meaning both need a meal with some fat in it to absorb properly. Take either on an empty stomach, and you waste much of the dose.

Is astaxanthin better than vitamin E?

That comparison comes from laboratory antioxidant tests, not from people. Being stronger in a test tube tells you very little about what happens in a human body, where absorption, distribution and dose all intervene. Nobody has run a trial pitting the two against each other for any outcome that matters.

Is the astaxanthin in krill oil enough?

No, not if you want a research dose. Krill oil supplies a small fraction of what supplements contain, and the pigment is partly there to stop the oil going rancid. Buy krill oil for the Omega-3 it delivers, but treat any astaxanthin as an incidental extra.

Does astaxanthin affect testosterone or DHT?

There is no good human evidence either way. The claim comes from combination products where astaxanthin is paired with other ingredients, saw palmetto among them, which makes it impossible to say what any single component did. Marketing has run some distance ahead of the research here.

Does astaxanthin help hair growth?

There is no meaningful human evidence that it does. The claim rests on the general antioxidant argument rather than on anyone measuring hair in a trial.

How much astaxanthin is in a portion of salmon?

A few milligrams at most. Farmed salmon get theirs from feed, often the synthetic form, so the amount is lower than the "eat wild salmon for astaxanthin" pitch implies. Neither approaches a supplement dose.

Astaxanthin Review: Benefits, Dosage & Evidence