Astaxanthin is a great antioxidant and has many potential benefits. I think it's better than taking vitamin C. But it can cause side effects, so it's necessary to be careful.
I was taking a relatively high dose of it and started getting stomach cramps. After that, I reduced my dose and I only take my astaxanthin right after meals. I have not experienced stomach cramps again.
I think it's a good idea for beginners start out with a low dose of this stuff and see if it's being tolerated well before increasing the dose.