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Brittle nails
Since starting low A my nails have been brittle and easily separate and crack. I am about 2 and a half months in. My skin has improved and has much less dry and flaky patches and I have experienced other improvements.
I would suggest biotin.
Could just be how your body shuttles the A around in detox or how long it takes to see improvements in nails. My nails have been like yours for several months - started just before the low vA diet and hasn't gotten better yet. Several years ago I went on low carb diet (and looking back, it was lower in A) and my nails became very brittle then. I had also been losing weight, when I gained it back by eating more, my nails grew back. Looking back, I think my body was releasing vA as I dropped fat pounds and when I gained the fat back, the circulating A had a place to hide again. I am not really having any improvements on the low vA diet, but since you are, I'm sure your nails will improve too.