It's actually called Anti-Aging Day Serum SPF 20 and it's a lower concentration zinc sunscreen than their Face Screens, but supposedly with anti-aging benefits... The closest thing that I would consider anti-aging depending on their concentration (seems to low here) are beta-glucans, NAC and vitamin E. Rest is either plain ingredients or not proven to work, like the fern thing. In any case it's less chalky and less drying than the Face Screens, but still not nearly perfect. It does leave streaks and dry spots even with a hardcore moisturizer underneath. I'd use it if I went to a beach, but not 'cosmetically elegant' enough for everyday use. Doesn't let UV rays through though, never a burn or any darkening with this one, so it performs well, but I consider Marie Veronique Kid Safe Screen to be vastly superior to this, better texture, bit more zinc, more elegant and at a better price. Only difference to Kid Screen: Day Serum comes in 3 tints, No Tint, Light and Medium. Some find it confusing and think No TInt is clear, but it's not clear/transparent, is very white in fact, goth makeup white, and it shows on skin. The white isn't gonna go away or sink in, it's just that, a white untinted zinc sunscreen. Light/Medium tints have pigments in them that make them better for a bit darker skins, but I find the tints to be too orange, just like Face Screen tints, it looks like foundation on skin. Not the best sunscreen option, too hard to get even application, not easy to remove, is drying to skin and can be irritating and may cause breakouts, I can't use it for more than a couple days in a row without at least a couple breakouts. Also it makes eyes and skin around nostrils itch, could be essentials oils in it. Might sound like a contradiction, but despite the drying effect, it does turn greasy at some point. It's like oil was on top and skin underneath suffers drought.

The sun serum SPF20 is an anti ageing serum with anti ageing ingredients. It does however leave a slight over cast of whitening. I expected this to be oily but its not.
It comes in a 30 ml dark bottle glass jar with a pipette which is very small if you have to reapply frequently. I like to use a serum/moisturiser underneath the serum as it does not feel hydrating enough on its own.
I would not purchase again as because of the white cast it leaves because its so high in zinc oxide.