A few months ago my ferritin level was at 6 and I thought I was going to die. I experienced a variety of symptoms including Vertigo, fatigue, tinnitus, depression, anxiety, POTS, heart palpitations, racing heart, etc. My doctor recommended I supplement with iron. I tried a few that ROCKED my stomach, others gave me migraines. Then I stumbled upon Vitron-C. It's far more tolerable than other iron supplements I'd tried and has brought my ferritin up to 21, which is helping many of my symptoms improve. **update: Now my ferritin is up to 36 and am still very happy with this supplement. I am finally starting to feel normal again!!! Out of the five iron supplements I've tried, this one is by far the best