10% Vitamin C + E Ferulic Acid Serum.

"One of my personal favorites is Timeless. This is the Timeless 10% Vitamin C + E Ferulic Acid Serum. They do 10, they do a 20. As with the retinoids earlier, I would say start with the 10, work your way up to the 20. Maybe use two bottles of the 10, then buy the 20. That way, your skin can get used to it, minimize side effects and irritation. Vitamin C helps create more collagen, but it's also preventative. It prevents that collagen degradation. So it's a bit of a double whammy. Vitamin C to get your glow game on point, prevent any collagen degradation, and also boost collagen production is another absolute essential when it comes to anti-aging."

"If you like to just use your vitamin C every single day, that's absolutely fine. My recommendation would probably be this, the Timeless Vitamin C 10%. A little does go a long way."

"If you're shopping in the North American market, Timeless does a 10% option which is phenomenal."

"If you're in the US or you struggle to get hold of Geek & Gorgeous, I always recommend the Timeless 10% Vitamin C. This is basically an exact dupe for the Skinceuticals CE Ferulic. It's got the penetration enhancing ingredient that the Skinceuticals one has in it to get that vitamin C into the skin to get working, it's got the ferulic acid and the vitamin E alongside it which is part of the patent that L'Oreal has for that Skinceuticals product. This is basically a dupe, it's better though because it's in a truly airless pump so it lasts longer. I mean Skinceuticals want you to pay £160 for a 30 mil serum that comes in a dropper, if you want to keep it fresh and stable airless pump is the way to go, and if Timeless can do that packaging on a budget I don't see why Skinceuticals can't. This is a better packaged product, it's basically the same formulation and I just think it works wonderfully. They have a 20% option too which if you like a high dose vitamin C you can go for, it's great, I'll link both below, but for me the 10% is where it's at, that sweet spot of maximum results, minimum side effects and irritation. So yes, Timeless, absolutely phenomenal if you're shopping in the North American skincare market and you want a product that's easy to access, better packaging and basically the same formulation to the CE Ferulic. Such an amazing, amazing product."

"They do a 10%, they do a 20%. [...] Different strengths work for different people. If you have sensitive skin, go for the 10%. If you've got resilient skin, go for the 20%. You got your furic acid. You've got your other antioxidants in here. You've also got a penetration enhancing ingredient which is really going to help this vitamin C to get into the skin to be super effective. Works really quickly. It has enhanced results. I actually find I got better results from this than the $150 skin suiticles. This is a fraction of the cost. [...] With this one, don't go wild and put 12 on order because whilst it is in airtight packaging, you will still get some oxidation if you leave it too long. So, I put like a maximum of two on order because you don't want it to be sitting around losing efficacy. [...] I like the 10%, I like the 20%. It really just comes down to individual skin sensitivity and needs. Both work really, really well. [...] An already ridiculously affordable vitamin C that comes in the best packaging that delivers so quickly and is just an all round superstar product."

"Great pH for maximum absorption. It also has a penetration enhancing ingredient in here, which is amazing if you're looking to double down on the speed at which you get your results. Just a nice blend of antioxidants, and it comes in an airless pump, so if you're somebody that likes your airless pump packaging, this is a really great option. That will extend the shelf life of this vitamin C from three months to something like four or five months. Timeless is a great option if you're in the US, if you're in Canada, if you're in Australia. It can be difficult to get if you're here in the UK or in the European Union, and that's because of that penetration enhancing ingredient, which is in a concentration that actually is over what is legally allowed within the European Union and the UK."

"These are the timeless vitamin C's. This is the 10% in [...] the larger bottle. [...] Generally speaking, 10% better for sensitive skin. [...] You get antioxidants and vitamin C together in this beautiful packaging, beautiful formulation, the best skin suiticles dupe out there. Skin suit is like £130. This is something like 19. [...] Vitamin C works best when it's fresh. So go with the size that meets how much you're actually going to use it and that way it keeps fresh for longer."

"This is the Timeless 10% Vitamin C, and I use the 10% strength. They do a higher strength version which people absolutely rave about, but for me it's a little too prickly on the skin. I find the 10% just works the best. One of the most effective vitamin C's out there and a beautiful formulation. Because Timeless [...] formulations don't have the longest shelf life, their average product will last about 6 months from the date it arrives, so don't buy too much that potentially could waste it."

"There are a couple of options to go for, and one of my personal favorites is this, the Timeless 10% Vitamin C. They do a 20% too, and I'll link both in the description, but for me the 10% is where it's at, minimum sensitivity, maximum results. This I love, it stays so fresh, meaning it just packs a punch from day one."

"One of my absolute favorite vitamin C's is this, the Timeless 10% Vitamin C plus E Ferulic Acid Serum. They do a 20% as well, it depends on the level of sensitivity you have in your skin."

"This is the Timeless vitamin C, and they do two strengths, this is the 10%, they also do a 20%. For me, my skin just loves a 10% vitamin C where I get maximum results, minimum irritation. If your skin is more resilient, you're an established vitamin C user, you can go for the 20% and you're probably going to see some enhanced results, but for me 10% just works universally. I think it's super easy to fit into a skincare routine and I get some great results. You guys have been asking me to try this out and review it for the longest time. Around 3 months ago I finally decided to take the plunge, the fear of missing out crept up on me, and I've never looked back. This is phenomenal."

"I'm particularly fond of the 10% vitamin C because I think it's pretty hard to find a 10% vitamin C. We know from studies that that is sufficient to be effective, and also the irritation is lower the lower the concentration you get. So I think this is a perfect vitamin C serum if you're looking for a new one or even if you want something to last with you over time and you have sensitive skin. 10% is great, my favorite product from them. It's a 10% vitamin C serum for like $15 with vitamin E and ferulic acid, the stabilizers and the penetration enhancers to make it more effective."

"For an ethyl ascorbic acid option, I'd pick the Timeless 10% Vitamin C. Vitamin C can easily be a coin flip on irritation, and the higher the concentration the more effective it can be, up to about 20%, but also the more irritating. For someone who wants to see if vitamin C works for them, you still get benefits at 10%, it's more gentle, and historically vitamin C had been very expensive but this one was relatively affordable. It's their bestselling product, a great option if you want ethyl ascorbic acid at an affordable price point without spending $185 on a vitamin C serum."

"This is a 10% L-ascorbic acid plus vitamin E and ferulic acid serum, which are the same three trifecta ingredients that you will find in Skinceuticals C E Ferulic, but this one is way, way more affordable and in my opinion, in my experience, it is every bit as good as that one and you save over $100 on this one. Vitamin C serum [...] is an absolutely crucial ingredient in a very well-rounded anti-aging routine. [...] Putting a vitamin C under your sunscreen in the morning is going to supercharge your SPF results because vitamin C is an antioxidant. That means it will scavenge those free radicals that the sun creates on our skin, and those free radicals are what attack our collagen and break our collagen apart. So if you put a vitamin C serum under your sunscreen in the morning, you're going to supercharge your results and you're going to keep the collagen in your skin for longer. You are going to prevent it from breaking down from UV damage. It's going to scavenge those free radicals away. [...] This one you can often find for 40, even 50% off, so that makes this around $13."

"This is one of my all-time favorite budget friendly swaps for that really expensive skin care product. This usually is $26 or $27, but last year I got this for 50% off. [...] This is 10% vitamin C, L-ascorbic acid, which is right in that range of 10 to 15% that is effective. It also comes in a 20% version. [...] This also has vitamin E and ferulic acid in it. Another thing I love about this that I think makes it even better is its packaging. It is an opaque closed container with a pump top. So this really takes care of the stability, protecting it from light and air. And this formula is just really simple and straightforward."

"10% is still a great dose to give you results and it actually even can decrease your side effects a little bit by bringing down the percentage of l-ascorbic acid. This one by Timeless is so so so affordable, I think baseline it's under $30 and then right now 40% off. I love the packaging of this, everything about this product is a 10 out of 10. If you don't need this unless you are like a rockstar vitamin C user, you are an advanced user, you've used it a long time, you don't have sensitive skin and you have like really stubborn dark spots or wrinkles."

"This is one of my favorite L ascorbic acid serums, which is way more affordable than the THD serum. This one by Timeless is the 10% vitamin C. You can get results with this. I strongly wholeheartedly believe you can get incredible vitamin C results from this just as much as you can from the $182 vitamin C serum. We don't need that. Their L ascorbic acid vitamin C E ferulic is amazing."

"This one also contains vitamin E and ferulic acid so this is going to be my recommendation for somebody who really loves that skin optical type of vitamin C serum"

"The vitamin C that I put on my neck is also from Timeless, it's their 10% vitamin C serum so this is going to be just a little bit gentler than the 20 version."

"The other thing that they came out with this year is the same vitamin C serum but in a 10% strength, because a lot of people can't use the 20%, it's just a little bit too strong. This is all the same great helper ingredients and the same formula as the 20%."

"I love this brand and I will still continue to use this brand. Ascorbic acid has a lower pH. It's more acidic. And so, this is going to create that cell turnover and it works a little bit quicker. With vitamin C derivatives, they have a higher pH around five or six. The same pH is what your skin is naturally, which is why it tends to be more gentle, but with derivatives, they can take a little bit longer to work as well. In my opinion, and from my experience, it really is just the acidity of the vitamin C that caused this instant reaction with my skin. So, right after I applied it, [...] within a half an hour, my skin started to feel quite tight, almost like I didn't have enough moisture on my skin. So that led me to apply more moisturizer on my skin. [...] And then again, within an hour or so, I felt very tight, especially around my mouth. And then I started to get this warming sensation with my skin."

"The 10% is amazing. I've used it many times over the years and it's also really effective. It does give that brighter complexion. [...] This formula is truly on point. It's very thin and lightweight, it's like water, your skin absorbs it really nicely, and it's definitely one of my favorite vitamin C formulations on the market."

"I do quite enjoy the Timeless vitamin C. They have a 20% and a 10%. My go-to vitamin C is the pure form ascorbic acid. I love the Timeless vitamin C. It has a super vitamin E in here which actually has more antioxidant properties to it and there is hyaluronic acid. I keep this in the fridge and it's lovely."

"The Timeless vitamin C is one of the best on the market, especially from what I have used, and you just can't go wrong with this brand. It's really affordable with different size options. If you don't want to use the 20% strength, they have a 10% and it's a little bit less potent but at the end of the day it still works really well and you still get great results. It really does brighten the heck out of your skin. If you're looking for a good vitamin C serum, honestly the Timeless brand is worth looking into."

"Timeless has a wonderful [...] 10% option if you want to use something that isn't as strong. It has that milky consistency to it and I love pairing coenzyme Q10 with vitamin C specifically ascorbic acid. I generally put the vitamin C serum on first then this afterwards then my moisturizer and then my sunscreen."