10 Vitamins You Should NEVER Take

Summary

Dr. Eric Berg argues that some inexpensive or synthetic supplement ingredients may be poorly absorbed or harmful in excess. He recommends checking labels and favoring nutrients from food or, where appropriate, different supplement forms.

The health risks and recommendations below are the speaker’s claims, not independently verified medical guidance.

The 10 ingredients he cautions against

1. Synthetic vitamin A — He says retinyl palmitate and retinyl acetate can accumulate in the body and may pose risks, including during pregnancy. He suggests getting vitamin A from foods such as egg yolks, liver, or cod liver.
2. Synthetic beta-carotene — He distinguishes it from active vitamin A and cites studies that he says found an increased risk of lung cancer among smokers taking synthetic beta-carotene. He favors natural food sources.
3. Folic acid — He says folic acid differs from active folate and may not be converted effectively by some people with an MTHFR gene variant. He recommends checking labels for folate and eating dark leafy greens.
4. Synthetic B12 (cyanocobalamin) — He says it is less bioavailable than methylcobalamin and that processing it uses glutathione. He suggests red meat or liver as food sources.
5. Calcium carbonate — He warns that it may accumulate in the body and says high supplemental calcium can raise heart-attack risk. He suggests dairy products and leafy greens, and claims calcium and magnesium should be taken in a 1:1 ratio.
6. Iron, especially ferrous sulfate — He says excess iron can be difficult for the body to clear and may be a particular concern for men, postmenopausal women, and people with hemochromatosis. He recommends avoiding iron supplements and fortified foods unless advised otherwise, and getting iron from foods such as liver or red meat.
7. Magnesium oxide — He describes it as poorly absorbed and says larger amounts may cause diarrhea. He favors magnesium glycinate, which he says is better absorbed and may support sleep, muscle function, and energy.
8. Vitamin D2 (ergocalciferol) — He says D2 is less effective than D3 and notes that D2 is commonly prescribed. He emphasizes vitamin D’s importance and points to sunlight as a source.
9. Omega-6 supplements, including linoleic acid — He argues that many people already consume too much omega-6 relative to omega-3 and that this imbalance may promote inflammation. He suggests getting fats from fish, cod liver oil, or grass-fed meat.
10. Copper — He says excessive copper, especially without sufficient zinc, may be harmful. He recommends getting trace minerals from foods such as shellfish, liver, or dark chocolate, and says people taking copper should consider its balance with other trace minerals.

Practical points emphasized

• Read supplement and food labels for ingredient forms, including retinyl palmitate, retinyl acetate, folic acid, cyanocobalamin, calcium carbonate, ferrous sulfate, magnesium oxide, and ergocalciferol.
• Favor food sources where possible and consider nutrient balance—especially calcium with magnesium and copper with zinc.
• The speaker also briefly mentions that other magnesium forms may have different absorption and uses.

Caution: The video makes broad claims about supplements and advises avoiding some nutrients. Don’t stop a prescribed supplement or change treatment based only on this summary; discuss individual needs with a qualified healthcare professional.

Presenter/source: Dr. Eric Berg, DC. No specific research papers or other named sources are identified in the subtitles.