Hi, just sharing this info if it's any help for anyone. I've always struggled to increase my ferritin levels over the years. It tends to stay down at 20-40 ug/L. Supplementing iron and eating iron rich foods will elevate it a bit more for me but what has worked the best is iron as a transdermal patch. These can easily be bought on Amazon. I used one that has a combo of 50mg of iron and 90mg of vitamin C per patch and wore one every night for a minimum of 8 hours and repeated this for 2 months.
My last ferritin result was 30 ug/L in April 2023. After the 2 months of using the patches and my reading is now 101 ug/L! I can feel the difference for the better too in how I feel. I used to get such an incredible zombie tiredness, with heavy head, this has now lifted with increasing my iron to a ferritin level of this Hope I can maintain it now.
PS to enhance absorption of the patches, my theory is to stick it over the inside of the wrists where it's thin skin and blood vessels are close to the surface. I alternative wrists each night. I put a patch on at night, so it doesn't get rubbed off with clothes and movement in the daytime.