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ISDIN Fotoprotector Fusion Water SPF 50 vs Round Lab Birch Juice Moisturizing Sun Cream

Same comparison whichever way you searched it: Round Lab Birch Juice Moisturizing Sun Cream vs ISDIN Fotoprotector Fusion Water SPF 50.

The bottom line

Round Lab Birch Juice Moisturizing Sun Cream does more across the board (it leads on hydration, barrier repair, oil-control & blemishes), while ISDIN Fotoprotector Fusion Water SPF 50 is the simpler, more pared-back pick.

Reach for Round Lab Birch Juice Moisturizing Sun Cream if you want the actives; ISDIN Fotoprotector Fusion Water SPF 50 if you want fewer ingredients doing less, gently.

Reviewed by Maya FaourLast reviewed September 2026
ISDINFotoprotector Fusion Water SPF 50Sunscreen · ~€24See every ingredient in Fotoprotector Fusion Water SPF 50, decoded
Round LabBirch Juice Moisturizing Sun CreamSunscreen · ~€16See every ingredient in Birch Juice Moisturizing Sun Cream, decoded

Which should you pick?

Pick Fotoprotector Fusion Water SPF 50 if

  • it is the one you can get most easily or already trust

Pick Birch Juice Moisturizing Sun Cream if

  • you are dealing with breakouts and oiliness
  • plump, lasting hydration is what you want
  • your skin is sensitive or reacts to fragrance

What each delivers

HydrationBarrierBrighteningOil-controlAnti-aging
Fotoprotector Fusion Water SPF 50Birch Juice Moisturizing Sun Cream
  • Hydration
    810
  • Barrier repair
    79
  • Brightening / tone
    1010
  • Oil-control & blemishes
    38
  • Anti-aging
    77

Side by side

Fotoprotector Fusion Water SPF 50Birch Juice Moisturizing Sun Cream
TypeSunscreenSunscreen
Key activesTinosorb S, Avobenzone, Vitamin C (LAA)Niacinamide, Tinosorb M, Glycerin
TextureFinish varies by batch and region, so check matte-vs-dewy before committing if that matters to you.Finish varies by batch and region, so check matte-vs-dewy before committing if that matters to you.
FragranceContains fragranceNone detected
Fungal-acne safeNot likelyLikely
PregnancyNo flagged activesNo flagged actives
Ingredients29 listed40 listed
Price~€24~€16

What's in one but not the other

The two labels share 6 of the 63 ingredients between them. The actives are where they part company.

What each one adds acts on On top of the skin, The stratum corneum for ISDIN Fotoprotector Fusion Water SPF 50 and The living epidermis, On top of the skin, The stratum corneum for Round Lab Birch Juice Moisturizing Sun Cream. That is the layer each is understood to act on, not how deep it travels.

Only in Fotoprotector Fusion Water SPF 50

Both share

Only in Birch Juice Moisturizing Sun Cream

Where each label stops telling you the dose

Ingredients are listed in order of how much is inside, but only down to 1%. Below that the brand may list them in any order it likes, so the bottom of a label is a set, not a ranking. These two stop being a ranking in very different places.

ISDIN Fotoprotector Fusion Water SPF 50

  1. 1Aqua (Water)
  2. 2Octocrylene
  3. 3Propanediol
  4. 4Butyl Methoxydibenzoylmethane
  5. 5Ethylhexyl Salicylate
  6. 6Polymethyl Methacrylate
  7. 7Dimethicone
  8. 8Phenylbenzimidazole Sulfonic Acid
  9. 9Polysilicone-15
  10. 10Propylene Glycol Dicaprylate/Dicaprate
  11. 11Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine
  12. 12Silica
  13. 13Dimethicone/Vinyl Dimethicone Crosspolymer
  14. 141,2-Hexanediol
  15. 15Hydroxyacetophenone
  16. 16Polysorbate 60
  17. 17PEG-10 Dimethicone
  18. 18Sodium Hyaluronate
  19. 19Tocopheryl Acetate
  20. 20Xanthan Gum
  21. 21Caprylyl Glycol
  22. 22Parfum (Fragrance)
  23. 23Disodium EDTA
  24. 24PEG-8
  25. 25Tocopherol
  26. 26Tropolone
  27. 27Ascorbyl Palmitate
  28. 28Ascorbic Acid
  29. 29Citric Acid

10 of 29 sit below the line, marked by Xanthan Gum.

Round Lab Birch Juice Moisturizing Sun Cream

  1. 1Water
  2. 2Dibutyl Adipate
  3. 3Propanediol
  4. 4Diethylamino Hydroxybenzoyl Hexyl Benzoate
  5. 5Polymethylsilsesquioxane
  6. 6Ethylhexyl Triazone
  7. 7Niacinamide
  8. 8Methylene Bis-Benzotriazolyl Tetramethylbutylphenol
  9. 9Coco-Caprylate/Caprate
  10. 10Caprylyl Methicone
  11. 11Diethylhexyl Butamido Triazone
  12. 12Glycerin
  13. 131,2-Hexanediol
  14. 14Butylene Glycol
  15. 15Betula Alba Juice
  16. 16Sodium Hyaluronate
  17. 17Hyaluronic Acid
  18. 18Glyceryl Glucoside
  19. 19Dipotassium Glycyrrhizate
  20. 20Allantoin
  21. 21Portulaca Oleracea Extract
  22. 22Artemisia Annua Extract
  23. 23Pinus Sylvestris Leaf Extract
  24. 24Anthemis Nobilis Flower Oil
  25. 25Acrylates/C10-30 Alkyl Acrylate Crosspolymer
  26. 26Sodium Stearoyl Glutamate
  27. 27Polyacrylate Crosspolymer-6
  28. 28Ethylhexylglycerin
  29. 29Ascorbic Acid
  30. 30Adenosine
  31. 31Pentylene Glycol
  32. 32Behenyl Alcohol
  33. 33Poly C10-30 Alkyl Acrylate
  34. 34Polyglyceryl-3 Methylglucose Distearate
  35. 35Decyl Glucoside
  36. 36Tromethamine
  37. 37Xanthan Gum
  38. 38T-Butyl Alcohol
  39. 39Tocopherol
  40. 40Carbomer

13 of 40 sit below the line, marked by Ethylhexylglycerin.

Below the line is not too little to work: ceramides, retinoids and peptides all act far under a percent. It means the position stops carrying information. Where the line falls is inferred from the first ingredient whose whole job is done at a fraction of a percent, so it is a close read of the label rather than a number from the formula sheet.

The molecule doing the work

Fotoprotector Fusion Water SPF 50Tinosorb S
Birch Juice Moisturizing Sun CreamNiacinamide

Better for…

  • Dark spots & uneven toneEither works
  • Fine lines & firmnessEither works
  • Breakouts & congestionBirch Juice Moisturizing Sun Cream
  • Dryness & dehydrationBirch Juice Moisturizing Sun Cream
  • Sensitive, reactive skinBirch Juice Moisturizing Sun Cream

Round Lab Birch Juice Moisturizing Sun Cream is the cheaper of the two (~€16 vs ~€24).

Ready to pick one?

Fotoprotector Fusion Water SPF 50 on amazon.comBirch Juice Moisturizing Sun Cream on amazon.com

Affiliate links, so a purchase sends us a small commission at no extra cost to you. As an Amazon Associate, Glow Simplified earns from qualifying purchases. We make and sell nothing here, so the verdict above never bends toward a sale.

Common questions

Is ISDIN Fotoprotector Fusion Water SPF 50 or Round Lab Birch Juice Moisturizing Sun Cream better for breakouts & congestion?

For breakouts & congestion, Round Lab Birch Juice Moisturizing Sun Cream is the stronger pick by our read of the two formulas. Round Lab Birch Juice Moisturizing Sun Cream does more across the board (it leads on hydration, barrier repair, oil-control & blemishes), while ISDIN Fotoprotector Fusion Water SPF 50 is the simpler, more pared-back pick. Reach for Round Lab Birch Juice Moisturizing Sun Cream if you want the actives; ISDIN Fotoprotector Fusion Water SPF 50 if you want fewer ingredients doing less, gently.

Which is cheaper, ISDIN Fotoprotector Fusion Water SPF 50 or Round Lab Birch Juice Moisturizing Sun Cream?

Round Lab Birch Juice Moisturizing Sun Cream is the cheaper of the two (~€16 vs ~€24).

Can I use ISDIN Fotoprotector Fusion Water SPF 50 and Round Lab Birch Juice Moisturizing Sun Cream together?

They are both sunscreens, so you would normally pick one rather than layer both in the same step. You can keep both and alternate them (morning and night, or on different days) if you like variety, but you do not need two.

What the scene shows

The cross-section at the top of this page is not decoration and not a diagram of the skin in general: it places the molecules these two are sold on at the layer each is understood to act on. ISDIN Fotoprotector Fusion Water SPF 50 is placed by Tinosorb S (on top of the skin), Avobenzone (on top of the skin), Vitamin C (LAA) (the dermis). Round Lab Birch Juice Moisturizing Sun Cream is placed by Niacinamide (the living epidermis), Tinosorb M (on top of the skin), Glycerin (the stratum corneum). A layer is where an ingredient does its work, never how deep it travels, and never a claim about how well it works.

Back up to the scene

Compare it with…

VSSupergoop!Unseen Sunscreen SPF 50Shares Octisalate and OctocryleneVSBeauty of JoseonRelief Sun: Rice + Probiotics SPF50+Shares Tinosorb M and Coco-Caprylate/CaprateVSNeutrogenaHydro Boost Water Gel SPF 50Shares Octisalate and Octocrylene
All 12 comparisons