A recent AOL Health article reiterates the dangers of synthetic vitamin overdoses. While some of the effects of these overdoses go away after discontinuing with the vitamin, others can cause lasting effects.

Some examples in the article include:

Vitamin A – overdosing on vitamin A can cause decreased bone density, osteoporosis, hair loss and liver problems. Excessive amounts of vitamin A during early pregnancy were linked to birth defects in a Boston University School of Medicine study.

Vitamin B6 – Studies suggest that excessive amounts may cause damage to the nervous system, specifically to the arms and legs.

Vitamin D – More than 2,000 IU daily can lead to too much calcium in the blood or hypercalcemia, which can lead to kidney stones and kidney damage.

Iron – Studies show that high iron levels may be a risk factor for heart disease. Iron also competes with important minerals, like copper, for absorption in the body. Too much iron can result in iron toxicity, which can progressively damage the liver, heart and endocrine glands. Without proper care, the damage done to these organs can ultimately result in premature death.

Zinc – Overexposure can lead to hair loss, ovarian cysts and muscle spasms.

The article does a good job letting you know what foods you can eat to derive these nutrients naturally. You can read the article in it's entirety at:

http://www.aolhealth.com/healthy-living/nutrition/vitamin-safety

NOTE: Nature’s Logic is the only line of pet food that does not use any synthetic vitamins, minerals, or amino acids.  Instead of the synthetics, we use whole food ingredients to derive nutritional adequacy for your pets.