My goal was to find a vitamin C derivative because ascorbic acid always burns my rosacea sensitive skin. And a lot of vitamin C products are sticky, stinky, or pill up under other products. So this was an expensive leap of faith. But the product exceeds expectations. Minimal redness when I first began using, no rosacea flare, no burning, not sticky, feels like a viscous gel serum but once applied layers so well under moisturizer and sunscreen I can't even tell its there. I also have very sensitive eyes, and didn't notice any irritation putting it around the eye area. It is too soon to tell long-term benefits, but I am super pleased that it is so gentle and hydrating that I probably will repurchase regardless.

I’ve used quite a few vitamin C’s over the year, Holi’s by far exceeds all others. It’s goes on so well and sets into my skin. I put Galiee on after, filling with Grand. My sunscreen and make up goes on so well after. I’ve noticed my skin tone get lighter and more even using. I love my Holifrog!!! 

Nice lightweight c serum.  not sure of the effectiveness, but I don't dislike it.

This has performed well. I really bought get it for the tranexamic acid and vitamin c mix,what a great combination. It’s  made my complexion brighter and some fading of old acne marks are are visible. Leaning towards repurchasing. But may try tranexamic acid in a stand alone formula.

The ingredients caught my attention. Tranexamic acid and THD vitamin c sounded like a winner. But it’s just meh no significant improvement not bad but not spectacular. Price is good for the quality so I may repurchase.

Wanted to love this! It just didn't do it for me. Going back to Sunday Riley. 

I have been using this serum for awhile now. It is the first time I have tried this particular one. I like it very much. That said, I cannot say that I think it is any better than others that I have tried. Definitely do not notice improvement in fine lines, wrinkles or discolorations. So...if you like to try different serums, I would say to give this one a try.

Honestly this is the best C on the market. Goes on like a cream and it instantly goes to work - firming and brightening. I’ve tried them all and Sunnyside gets an A+….in fact, it’s this year’s Xmas gift to all. 

Too soon to see results, but I do like the ingredient list.  My only ding is that it goes on and stays very sticky. Still, looks promising.

I have been using HoliFrog's Sunnyside C Serum for a week, now. This one is a winner!! Over the years, I have used at least a dozen Vitamin C serums, some better at accomplishing their marketed claims than others. Sunnyside C Serum is about as good as it claims to be. In just a week I can already see a lightening effect of my skin and a more evenly-complected face. I always use products for at least 28 days in order to evaluate whether or not they are effective and therefore worth keeping. However, I am impressed after only a week of using this wonderful Vitamin C serum. Thank you, Holifrog!!