To commercially produce natural Astaxanthin from Haematococcus pluvialis, two factors are strictly needed.
an exceptionally clean environment so the microalgae can grow strong without contamination or biological competition, and an intense light source to enable carotenogenesis of Astaxanthin. Both conditions can be created and forced using human technology but, what if there is a perfect place on Earth where you can access both naturally? There is such a place, and it is the Atacama Desert in the North of Chile.
Atacama is a remarkably clean environment as it is away from urban zones (polycyclic aromatic hydrocarbons), agricultural zones (pesticides), rainy areas (acid rain) and regions with fauna presence (salmonella, feces). Proof of this are the many astronomical observatories that chose the location due to the exceptionally clear, pristine skies. This desert has the highest solar irradiation in the world which, combined with the environmental cleanliness, provides vibrant year-round sunlight that strongly stimulates Haematococcus pluvialis to produce the most potent natural Astaxanthin.