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(Source 2, 3) "The primary downside of iron supplementation is the high rate of potential side effects, particularly gastrointestinal side effects, including nausea, vomiting, and constipation." Potential Side Effects of Iron Iron supplements, especially when taken without food on an empty stomach, can sometimes cause side effects such as constipation, nausea, stomach cramps, or a metallic taste-especially with traditional forms like ferrous sulfate
The answer: largely through compounding pharmacies and gray-market suppliers

A 2021 review published in Biomedicine & Pharmacotherapy explains that silymarin, the main active compound in milk thistle, can:25 Regulate the cell cycle, helping to ensure proper division and replication Induce apoptosis, or programmed cell death, by which the body can eliminate mutated cells (e.g., cancer cells) Regulate the body's immune response, increasing its ability to recognize and attack cancer cells Keep tumor cells from growing and spreading Inhibit angiogenesis, the process by which tumors create new blood vessels that increase their blood supply and help them grow The review specifically discusses silymarin's therapeutic potential for gastrointestinal cancer, but as another set of researchers note, silymarin has a pleiotropic effect, meaning it can act on multiple targets.26 Again, more research may be needed, but the current science suggests that milk thistle may have fairly broad complementary utility in cancer therapy

Treatment plans vary in dosing, frequency, and duration depending on your response and clinical profile
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