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Iron
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I've been doing some research and the sources are contradictory.
This study:
pubmed.ncbi.nlm.nih.gov
"In conclusion, our results show that repeated topical application of a preparation containing both retinol and vitamin C is able to reverse, at least in part, skin changes induced by both chronologic aging and photoaging."
https://www.paulaschoice.fr/en/6-retinol-myths-busted
" MYTH #6: YOU SHOULDN'T COMBINE RETINOL WITH VITAMIN C
Vitamin C (ascorbic acid and its derivatives) is another ingredient often cited as a problem when combined with retinol. As with the AHA and BHA myth, this one is also based on the pH/acidity issue.
The truth: Vitamin C (depending on the form) requires a low pH (or no pH at all, as is the case in non-aqueous, silicone-based formulas) to remain stable. We know retinol works in an acidic environment and that skin's pH is naturally acidic, so from what the research has shown us, here's a clear case where the coupling of vitamin C + retinol makes sense.
Research has shown that a combination of vitamins in cosmetics is the way to achieve the best results, including the combination of vitamins A, C, and E. In a double-whammy myth-buster, retinol proved to be not only effective when paired with vitamin C, but the two also worked beautifully to defend skin against free radicals when applied under a sunscreen! That wouldn't be the case if retinol made vitamin C ineffective or vice-versa.
Vitamin C actually helps retinol work better! It fights free radicals, a process that helps protect retinol from oxidization as it penetrates deeper into the skin—thereby increasing its anti-ageing benefits! One could argue that not using retinol with vitamin C (or some other potent antioxidant) puts your skin at a disadvantage."
And on the other hand:
" For example, your skin may get irritated if you use a serum with vitamin C (which is acidic) and as well as a retinol cream, or if you use a retinol serum along with a prescription retinol cream."
www.google.com
“Vitamin C and retinol work optimally in different pH environments, and thus, should typically not be combined,” Chang said, nothing that “vitamin C products are formulated to be at a low pH of less than 3.5, while retinol works best at a pH of 5.5-6.”
In general, she said to avoid combining the two ingredients. She recommends using a vitamin C serum in the morning and retinol cream at night “to ensure full efficacy of both ingredients.”
Some product even combine retinol and vit c
https://eu.facetheory.com/products/...MIt5qV1YvV6QIVBfhRCh1lZQjNEAAYASAAEgKeQvD_BwE
Any idea?
I've also been looking for studies on the effect of the use of tretinoin and vit c at the same time but I didn't find shit.
Just mix vit c +tretinoin+ moisteriser+spf to spend less time covered in white c(um)ream theory
@benignice what's your opinion on that?
This study:
Histological evaluation of a topically applied retinol-vitamin C combination - PubMed
Two double-blind studies versus vehicle were carried out to investigate the effects of a topically applied retinol plus vitamin C combination on epidermal and dermal compartments of aged or photoaged human skin. The two studies were performed on postmenopausal women who were selected for...
pubmed.ncbi.nlm.nih.gov
https://www.paulaschoice.fr/en/6-retinol-myths-busted
" MYTH #6: YOU SHOULDN'T COMBINE RETINOL WITH VITAMIN C
Vitamin C (ascorbic acid and its derivatives) is another ingredient often cited as a problem when combined with retinol. As with the AHA and BHA myth, this one is also based on the pH/acidity issue.
The truth: Vitamin C (depending on the form) requires a low pH (or no pH at all, as is the case in non-aqueous, silicone-based formulas) to remain stable. We know retinol works in an acidic environment and that skin's pH is naturally acidic, so from what the research has shown us, here's a clear case where the coupling of vitamin C + retinol makes sense.
Research has shown that a combination of vitamins in cosmetics is the way to achieve the best results, including the combination of vitamins A, C, and E. In a double-whammy myth-buster, retinol proved to be not only effective when paired with vitamin C, but the two also worked beautifully to defend skin against free radicals when applied under a sunscreen! That wouldn't be the case if retinol made vitamin C ineffective or vice-versa.
Vitamin C actually helps retinol work better! It fights free radicals, a process that helps protect retinol from oxidization as it penetrates deeper into the skin—thereby increasing its anti-ageing benefits! One could argue that not using retinol with vitamin C (or some other potent antioxidant) puts your skin at a disadvantage."
And on the other hand:
" For example, your skin may get irritated if you use a serum with vitamin C (which is acidic) and as well as a retinol cream, or if you use a retinol serum along with a prescription retinol cream."
These Skin Care Ingredients Should Never Be Used At The Same Time
Vitamin C, retinol, sunscreen ... some ingredients shouldn't be applied together.
“Vitamin C and retinol work optimally in different pH environments, and thus, should typically not be combined,” Chang said, nothing that “vitamin C products are formulated to be at a low pH of less than 3.5, while retinol works best at a pH of 5.5-6.”
In general, she said to avoid combining the two ingredients. She recommends using a vitamin C serum in the morning and retinol cream at night “to ensure full efficacy of both ingredients.”
Some product even combine retinol and vit c
https://eu.facetheory.com/products/...MIt5qV1YvV6QIVBfhRCh1lZQjNEAAYASAAEgKeQvD_BwE
Any idea?
I've also been looking for studies on the effect of the use of tretinoin and vit c at the same time but I didn't find shit.
Just mix vit c +tretinoin+ moisteriser+spf to spend less time covered in white c(um)ream theory
@benignice what's your opinion on that?
