UV-Vis Spectrophotometry: A quick check. It measures how much light astaxanthin soaks up to find its concentration.

TLC: A basic “yes/no” test. It shows if astaxanthin is present, but isn’t as precise as HPLC.

2. What’s Astaxanthin Made Of?

• Natural (from algae like Haematococcus pluvialis): Mostly “trans-isomers” (these work better in the body) plus tiny bits of “cis-isomers.” It may also have other helpful carotenoids or vitamins.
• Synthetic (man-made): A mix of trans and cis-isomers (more cis than natural). It’s purer but lacks the extra nutrients from algae.

3. Where Do You Use Different Astaxanthin Levels?

• Low (1%–5%): Daily supplements (capsules, tablets) and basic skincare (lotions, serums) use this.
• Medium (5%–10%): Added to fish/shrimp feed (to make their color brighter, which buyers love) and high-end cosmetics/drinks.
• High (10%+): Used for medical research and small-batch, premium skincare that targets specific skin issues.

4. Does Astaxanthin Dissolve Easily? What Color Is It?

• Solubility: It dissolves great in oils (perfect for oil-based capsules!). It won’t dissolve in water—you need special processing (like microencapsulation) to make it work in water-based products (drinks, light lotions).
• Color: Natural astaxanthin is bright red or pink-red. Synthetic is more orange-red. The higher the concentration, the deeper the color.

5. How to Store Astaxanthin Properly?

• Keep it cool: Store at 2–8°C (36–46°F) or freeze at -20°C (-4°F) for long-term use. Avoid heat (like direct sun or near heaters).
• Block the light: Use opaque containers—UV light breaks it down.
• Seal tight: Oxygen makes it less effective, so keep containers closed. Some products use nitrogen gas to protect it.
• Choose the right container: Dark glass bottles or aluminum foil bags work best (they’re clean, dry, and stable).