10 Vitamins You Should NEVER Take
Dr. Eric Berg DCPublished on September 28, 2025
Summary authored by editor@wellifi.com
TLDR Summary
This article discusses ten vitamins and minerals to avoid due to their potential dangers, particularly in synthetic forms. Natural sources are recommended for optimal health benefits.
Key Points
- Synthetic vitamin A can accumulate in the body and be toxic.
- Synthetic beta-carotene increases lung cancer risk in smokers.
- Folic acid can lead to an accumulation in those with the MTHFR gene mutation.
- Synthetic B12 contains cyanide and is less bioavailable than natural B12.
- Calcium carbonate can increase heart attack risk and should be replaced with natural sources.
- Iron supplements can be dangerous and are better sourced from food.
- Magnesium oxide is poorly absorbed and can cause digestive issues.
- Synthetic vitamin D2 is less effective than natural D3.
- Omega-6 fats are inflammatory and should be limited.
- Excess copper can be toxic and should be consumed in balance with zinc.
10 Vitamins and Minerals You Should Never Take
In today's health landscape, it's essential to be well-informed about what supplements we are putting into our bodies. While many vitamins and minerals are beneficial, there are some that can be harmful, especially when consumed in synthetic forms. In this article, we will explore ten vitamins and minerals that you should avoid, not because they are ineffective, but because they can pose significant health risks.
1. Synthetic Vitamin A
Synthetic vitamin A, found in many supplements, must be converted into its active form in the body. This conversion process is inefficient, leading to a buildup of toxins that can be harmful, especially during pregnancy. Instead, opt for natural sources such as egg yolks, liver, and cod liver oil.
2. Synthetic Beta-Carotene
Commonly mistaken for vitamin A, synthetic beta-carotene is derived from coal petroleum and can increase lung cancer risk in smokers. The natural version, however, offers protective benefits. Choose whole foods like carrots for your beta-carotene intake.
3. Folic Acid
Folic acid, a synthetic form of vitamin B9, can be problematic for individuals with the MTHFR gene mutation, leading to an accumulation of folic acid in the blood and increased cancer risk. Instead, consume folate-rich foods like dark leafy greens.
4. Synthetic B12 (Cyanocobalamin)
This synthetic form of B12 contains traces of cyanide and is less bioavailable than its natural counterpart, methylcobalamin. It can deplete glutathione levels in the body, which is vital for detoxification. Natural sources like red meat and liver are preferable.
5. Calcium Carbonate
Often the main ingredient in calcium supplements, calcium carbonate can lead to arterial and kidney buildup, increasing heart attack risks. It’s better to obtain calcium from dairy products and leafy greens while balancing with magnesium.
6. Iron
Iron supplements, especially ferrous sulfate, can be dangerous due to their corrosive nature and the body's inability to excrete excess iron efficiently. Instead of supplements, obtain iron from natural sources like liver and red meat.
7. Magnesium Oxide
Despite magnesium's importance, magnesium oxide is poorly absorbed (only about 3%) and can cause diarrhea when taken in larger doses. Opt for more bioavailable forms like magnesium glycinate.
8. Synthetic Vitamin D (Ergocalciferol)
Synthetic vitamin D2 is less effective than the natural vitamin D3. Many prescriptions contain D2 instead of D3, which is crucial for immune health. Aim to get vitamin D from sunlight and natural food sources.
9. Omega-6 Fats
Many supplements contain omega-6 fats, which are pro-inflammatory. The typical American diet is already loaded with omega-6, so it’s best to focus on omega-3 sources like fish and cod liver oil.
10. Copper
While copper is essential, excessive amounts can be toxic and lead to oxidative stress and inflammation. Maintain a proper zinc-to-copper ratio and source copper from foods like shellfish and liver.
Conclusion
Vitamins and minerals are vital for our health, but the forms in which we consume them matter significantly. By avoiding these ten harmful supplements and choosing natural sources, you can better support your overall health and well-being.