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Most Recent Questions
Recent Question:
Why rosemary, mint, and alcohol? Is there a reason for these irritating ingredients to be in this product?
Recent Question:
Can this sunscreen be used for babies?
Recent Question:
Sephora-include ingred. info plz!!
Recent Question:
This is marketed as a sunscreen but the bottle says moisturizer- which is it?
Questions with Most Recent Answers
Question:
compare to coola's mineral face spf 30 matte tint
Question:
Pump clogs? I just got this and barely got 2 squirts before the pump stopped working. I tried to rinse it in warm water but still nothing.
Question:
Why rosemary, mint, and alcohol? Is there a reason for these irritating ingredients to be in this product?
Question:
Does this cause or worsen breakouts?


Algenist Ultra Lightweight UV Defense Fluid SPF 50

What it is:An ultra-sheer, weightless fluid for everyday protection against broad-spectrum UVA/UVB damage. What it does:This fast-absorbing, ultra-lightweight fluid provides daily protection against broad-spectrum UVA/UVB damage. Alguronic Acid combines with antioxidant-rich botanicals and UVA/UVB protecting actives to delay signs of aging caused by sun and environmental stressors. This oil-free, sheer formula has a silky texture and weightless feel, designed to apply smoothly on top of other skincare products and under makeup for a soft, matte finish. What it is formulated WITHOUT:- Parabens- Sulfates - Synthetic Dyes- Phthalates- GMOs- Triclosan What else you need to know:Alguronic Acid is a unique and powerful regenerative compound from microalgae. This rare ingredient was discovered unexpectedly by a biotechnology laboratory in San Francisco, CA, focused on researching renewable energy solutions. Algenist is the only line of skincare products to contain the antiaging power of Alguronic Acid. Research results:In comparison testing, Alguronic Acid outperformed other well-known active antiaging ingredients, demonstrating superior antiaging benefits: -54% decrease in UV cell damage -55% increase in cellular regeneration -32% increase in elastin synthesis -26% decrease in melanin production *Average results measures following an in-vitro test with Alguronic Acid.
Questions & Answers:
17 Questions
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45 Answers
Overall Rating:
4.441 out of 5
4.4
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Product Details

Questions & Answers for Algenist Ultra Lightweight UV Defense Fluid SPF 50

Question
if someone could compare the Algenist with the Day Screen High Protection SPF 40 of Clarins.
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asked 2 years, 4 months ago
Anonymous
on Ultra Lightweight UV Defense Fluid SPF 50
5 answers
Answers
answer 1
Clarins relies on titanium dioxide which covers a relatively small section of the UV spectrum - the 'broad spectrum' in that formulation is either chemical or lesser than the Algenist formulation which relies on a high % of zinc oxide. Zinc oxide covers most of the UV spectrum. The U.S. lacks reliable marking for the whole UV spectrum - SPF only refers to UVB rays - on some foreign origin products, you may see a PA rating which refers to UVA rays. A high SPF aptitude a significant PA rating is a good bet. I would not rely on a product using primarily titanium dioxide or a low % of zinc.
answered 2 months, 3 weeks ago
hyacinthboquet
answer 2
I have to disagree with another respondent, who says the Clarins "UV Plus HP Broad Spectrum SPF 40 Sunscreen Multi-Protection" is a sunblock and isn't broad spectrum - it is both sunscreen and broad spectrum, it's right there in the name. I regularly use both the Clarins and Algenist, and they are quite comparable. The Algenist is slightly lighter when going on but they both dry down nicely. The Algenist bottle is smaller, which may lead you to apply less than you should be applying if you aren't careful, and that measurement thingy on the side is pointless since the bottle is opaque (you wouldn't want a clear bottle for something which can be degraded by exposure to light anyway!). All in all, you can't go wrong with either one. Clarins is a better price, especially if you can nab one of those boxes in store that has two untinted bottles for $60, but if you are really going for the most lightweight and high SPF protection possible, don't mind having to buy a new bottle more frequently, and won't skimp on the product application because of the fact it comes in such a small bottle, Algenist is your answer.
answered 6 months ago
LadyHuggington
(San Francisco, CA)
answer 3
I use Clarins and I have very pale skin. It works great for me and doesn't give give me hives (which chemical sunscreen does).
answered 1 year, 11 months ago
Feryn
(Berkeley, CA)
answer 4
I haven't tried the Clarins but I love this it goes on smooth and I like the SPF factor
answered 2 years ago
msjani
(santa clarita ca)
answer 5
The difference is that Clarins sunblock is not broad spectrum: the only active sunblocking ingredient there is titanium dioixide which does not protect against all uva rays, that as we know, are responsible for aging.
answered 2 years, 3 months ago
Romannatasha
(Palo Alto, CA)
Question
does it leave a white cast?
asked 3 years ago
padthai
on Ultra Lightweight UV Defense Fluid SPF 50
4 answers
Answers
answer 1
A little bit, but if you wear powder or bronzer over it you can cover it up.
answered 9 months ago
sd4me
(San Diego, CA)
answer 2
No. The liquid is white, but it blends in clear on your face. No white haze.
answered 2 years, 1 month ago
carebears
(Bakersfield, CA)
answer 3
Nope, it didn't leave any whiteness at all.
answered 2 years, 3 months ago
cnickyc
(Morehead City, NC)
answer 4
No, it blends in perfectly!
answered 2 years, 11 months ago
Anonymous
(Miami, FL)
Question
Clear?
Hi, is this a clear liquid?
asked 2 years, 3 months ago
suxx2bu
(Westmont, IL)
on Ultra Lightweight UV Defense Fluid SPF 50
4 answers
Answers
answer 1
No, it's a creamy white moisturizer.
answered 9 months ago
sd4me
(San Diego, CA)
answer 2
The liquid is white, but blends in clear on your face. No white haze at all.
answered 2 years, 1 month ago
carebears
answer 3
It is a white light weight cream, but does not leave a white film on your face like many other sun blocks do.
answered 2 years, 2 months ago
cabaretdiva
(Vienna, VA)
answer 4
Nope, it's a white colored fluid.
answered 2 years, 3 months ago
cnickyc
(Morehead City, NC)
Question
Can this be applied to eye contour area?
I used the Clarin SPF40 and it can be applied to the eye contour area. I tried this product and love that it goes on clear and leaves a light matt finish but was wondering if this can also be applied to the eye contour area?
asked 1 year, 8 months ago
Anonymous
(Palo Alto, CA)
on Ultra Lightweight UV Defense Fluid SPF 50
4 answers
Answers
answer 1
I use it occasionally on the eyes, on top of the eye cream and underneath eye primer and make-up. Works perfectly, not greasy and no creases.
answered 7 months ago
EvaV
answer 2
I use it under my eyes! I have very sensitive skin and typically react if something is near my eyes. This product hasn't caused any problems for me.
answered 1 year, 4 months ago
JumpyJenny
(Porland, OR)
answer 3
i havent used it for the eye area...you should be wearing sunglasses in the sun or you will get cataracts
answered 1 year, 8 months ago
msjani
(santa clarita ca)
answer 4
Yes, I wear it all the time around the eye area without irritation or stinging.
answered 1 year, 8 months ago
sugardoll
(San Diego, CA)
Question
is this also a moisturizer?
asked 1 year, 3 months ago
cymbals
(cedarhurst, NY)
on Ultra Lightweight UV Defense Fluid SPF 50
4 answers
Answers
answer 1
No, you put it on top of your moisturizer. At least, that is what the consultants at Sephora told me! They said, "SPF is always last". BTW, I've been using this about a month and love it. It is sheer and goes right in. Lovely.
answered 4 months, 4 weeks ago
Kittyinva
(Warrenton, VA)
answer 2
Yes, it's a moisturizer with SPF 50, which is way better daily protection than the SPF 15 found in most moisturizers.
answered 9 months ago
sd4me
(San Diego, CA)
answer 3
I don't think so. I would use a moisturizer first, then apply this.
answered 1 year, 3 months ago
Aag77
(Herhsey, PA)
answer 4
No, this is just a sunscreen.
answered 1 year, 3 months ago
1877SEPHORA
(San Francisco, CA)
Question
How do you remove this sunscreen?
The Algenist Ultra Lightweight UV Defense Fluid stays on SO well that it won't come off at the end of the day without some kind of very very heavy duty exfoliating product. Not even a Clarisonic will get rid of it! Is there something else that will dissolve and remove this sunscreen at the end of the day? It's my favorite!
asked 2 years, 3 months ago
Anonymous
(San Francisco, CA)
on Ultra Lightweight UV Defense Fluid SPF 50
3 answers
Answers
answer 1
I've been using this product for a year. I've noticed that it's difficult to wash off my hands when I wash them immediately after application. However, by the end of the day, I haven't had any issues washing it off my face. Have you tried a mineral oil based makeup remover?
answered 1 year, 4 months ago
JumpyJenny
(Porland, OR)
answer 2
wow mine comes off easily I use a gentle cleanser and a toner
answered 2 years ago
msjani
(santa clarita ca)
answer 3
I would recommend using a makeup removal wipe or cleanser before just using face wash.
answered 2 years, 3 months ago
1877SEPHORA
(San Francisco, CA)
Question
Acne prone skin
I have moderately acne prone/ combination skin. Will this break me out?
asked 6 months ago
cbrownn
on Ultra Lightweight UV Defense Fluid SPF 50
3 answers
Answers
answer 1
This product did break me out!
answered 3 months, 1 week ago
jessicad22
answer 2
That is something no one can predict. I can say that if you have a sensitivity to the chemicals in sunscreen, that this is not one of the more irritating ones. However its not advertised as non comedogenic
answered 5 months, 3 weeks ago
synaptic
(Los Angeles, CA)
answer 3
i have combination skin and occasionally get pimples. This did not break me out.
answered 6 months ago
ash99
(Wash DC)
Question
Should this be put on first or last?
I've seen some reviewers mention that they put their makeup on top of this sunscreen. I always thought we should put sunscreen on as the very last step in daily skin care. Does anyone know for sure? Or, does anyone have a very educated guess?
asked 3 months, 2 weeks ago
dll770
(Northeast Iowa)
on Ultra Lightweight UV Defense Fluid SPF 50
3 answers
Answers
answer 1
Yes, according to my dermatologist it is the last step in your skin CARE - which is generally separate from makeup. That can cause confusion. I second the previous posters - cleanse, serum, moisturize if you have dry skin, THEN sunscreen. Then makeup. And don't forget to reapply sunscreen during the day - even high spf sunscreen won't last all day long.
answered 3 months ago
7654
(brooklyn, ny)
answer 2
I too apply sunscreen the last in my am skincare. So my routine goes, serum, moisturizer (only if skin is dehydrated) and then sunscreen.
If you have oily or normal skin, you may not need anything other than a treatment then sunscreen.
answered 3 months, 1 week ago
leopardprint
(SF Bay Area, NorCal)
answer 3
I was told by Sephora personnel that this goes on last of all the creams, pre-makeup. I have also reapplied it over makeup, as Algenist claims you can do. It works well both ways. I love it!
answered 3 months, 1 week ago
Kittyinva
(Warrenton, VA)
Question
Is this a moisturizer?
As not all sunblocks are, is this a moisturizer? Or is it meant to go over a moisturizer? Can it just be worn over the serum? I'm 59 and havean oily t-zone.
asked 2 years, 11 months ago
donnamariet
(LaCrescenta, CA)
on Ultra Lightweight UV Defense Fluid SPF 50
3 answers
Answers
answer 1
Yes, it's a moisturizer and it made my oily T-Zone go away. It has a matte finish.
answered 9 months ago
sd4me
(San Diego, CA)
answer 2
I use it over a moisturizer. But it really depends on your skin. I have an oily t-zone as well and don't find that it makes me more or less oily. You might try with and without a moisturizer and see.
answered 2 years, 2 months ago
cabaretdiva
(Vienna, VA)
answer 3
for my combo skin, it is not moisturizing. if i'm feeling dry, i use a moisturizer before i apply it. i've also used a serum under it as well without issue.
answered 2 years, 10 months ago
padthai
(nyc)
Question
PA level?
SPF 50 and what is the PA level ?
asked 2 years, 11 months ago
Anonymous
(Amherst, MA)
on Ultra Lightweight UV Defense Fluid SPF 50
2 answers
Answers
answer 1
The active ingredients are Octinoxate, 7.5% Titanium Dioxide, 2.0% Zinc Oxide, 17.1%, in my experience it should has at least PA++ strength.
answered 1 year, 1 month ago
vivivian
(Winston-Salem NC)
answer 2
PA is our Asian thing... I think it's some Japanese rating, PA is just some '+', the more '+' it has the more sun-protective it is. I don't think PA rating has a big difference with the SPFs, only that SPF is easier to calculate (like SPF rating * 10 minutes or so)
answered 1 year, 6 months ago
Queenieeeeeeee
(Ontario)
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