Vitamin D
★★★★★
In the following study the potential usefullness of vitamin D3 and quercetin are discussed in relationship to keloids. Quercetin is a commonly available supplement and vitamin d even more so. Both have very good safety profiles at a minimum and are relatively inexpensive to buy. Both supplements also are known to have many other health benefits, while being vitamin d deficient is known to have bad effects on human health.
It is fairly well established now that the majority of people have insufficient levels of 25 OH d which is the serum test for vitamin d. The reference range for vitamin d or 25 OH d is 30~100 ng/ml. Winter time only tends to worsen the deficiency because of the lack of effective UVB exposure combined with the increased atmosphere distance that the sun's rays have to pass through during our winter's in the USA. All good reasons to check with your doctor to see if including or increasing vitamin d is something healthful for you to try. Remember that age also plays a factor in our bodies ability to convert uvb rays from the sun into vitamin d in our skin. As we age, this ability diminishes and is just one more reason to consider supplementing. If you are insufficient (below 30 ng/ml) or deficient (below 20 ng/ml) and have keloids, maybe your body is trying to tell you something!
If you have keloids that have not responded to other treatments or have not responded well or just keep coming back, then it might be worth discussing this study with your doctor to see if vitamin d might be worth trying with or without quercetin. At a minimum your doctor may recommend getting closer to the top of the reference range than the bottom, at least while actively trying to see if vitamin D can improve your keloids.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4883603/
Here is an abstract from 2011 that also suggests that vitamin d may be useful when it comes to keloids:
https://www.ncbi.nlm.nih.gov/pubmed/21070203
Here is a full study from 2015 that also points to vitamin D as potentially being useful for keloids.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4494495/
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