That would be dry Vitamin A. The retinyl acetate form. It's oil free & absorbs the fastest. This would boost your immune system the most, as your liver will stop functioning without retinoids. Carotenoids are different. Your liver won't die without carotenoids. You won't develop fatty liver or blindness. Or have lipid indigestion which collapses your hormones. However, the keto-carotenoids like astaxthanin are amazing. They are really powerful. If your goal is mere survival, I'd stick to retinyl acetate. If your goal is to thrive, I would combine retinyl acetate with astaxthanin. Every day I do retinyl acetate / astaxthanin / lutein... the combo of those 3 is amazing for energy, skin, mood, sleep. But the 1st one you should always buy is the dry, absorbable retinyl salts.
