Well - The article you have read really isn´t an endorsement of apple seed. It is an endorsement of apricot seeds, which is claimed to contain something wrongfully called vitamin B17.
It is not a vitamin. Amygdalin/laetrile was claimed to be a vitamin by chemist Ernst T. Krebs in the hope that if classified as a nutritional supplement it would escape the federal legislation regarding the marketing of drugs. He could also capitalize on the public fad for vitamins at that time. Since the early 1950s, a modified form of amygdalin has been promoted under the names laetrile and “Vitamin B17? as a cancer cure.
It has been tested to see if it really is effective as a cancer treatment. And the results were disappointing. Here is a review from 2007 based on 36 clinical studies on the effect of laetrile on cancer in patients: http://www.ncbi.nlm.nih.gov/pubmed/17106659?itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum&ordinalpos=2
None of these studies proved the effectiveness of laetrile.
Laetrile contains cyanide, which is a type of poison. So the side effects of laetrile are the same as those of cyanide. These include
* Liver damage
* A lack of oxygen to the body tissues
* A drop in blood pressure
* Drooping eyelids
* Nerve damage, causing loss of balance and difficulty walking
* Confusion, coma and eventually death
It is estimated that eating approximately 50 to 60 apricot kernels, or 50g of laetrile, can cause death.
The lack of evidence and the risk of serious side effects are more than good reasons to ban its use as cancer treatment.
Here is more on the Laetrile myth: http://www.cancerhelp.org.uk/about-cancer/treatment/complementary-alternative/therapies/laetrile