The best replacement for carotenoids is vitamin a.

The best alternatives to carotenoids are rated as following:
★★★★★  vitamin a
★★★  chlorophyll
★★★  chlorophylls

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Speaking about carotenoids, one probably shouldn't forget about vitamin a.

Other search terms related to carotenoids and their ratings are:
★★★★★ vitamin a
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carotenoids
vitamin a
chlorophyll