IMHO
Buying and taking any supplements should ONLY be considered for periodic use if you know that you are not able to consume a good, healthy diet for any reason, for a prolonged period.
Supplements can be expensive, vary in quality, and may even result in negative impacts/adverse effect if you are not completely clued-up about how they inter-act.
It would be far better to try and divert supplement spending onto purchasing good fresh foods - PARTICULARLY organic foods (don't be distracted by the nay-sayers - organics are the only products that will definitely help you reduce toxins in your food consumption).
To reduce your chances of developing cancer (for that is all you can do - in the Western/developed world there is an incidence as high as 1 in 3 for developing some kind of cancer in our lifetimes now) you need to REDUCE your exposure to toxins, and generally overhaul your lifestyle.
The three major routes we are exposed to toxins - are - via the foods/liquids we consume; via the air we breathe/environments we are exposed to; via the substances our skin comes into contact with.
Rather than keep lining the pockets of the 'pill companies' - think about the strategies you can implement in these three areas of exposure to toxins that you can take readily and easily...to whit:
1) Reduce consumption of processed foods and drinks of any kind. Increase consumption of reliable source of pure clean water. Choose less toxically grown foods - fresh vegetables from organic farms; meats and fish also farmed organically. Try and include some oily fish in your diet - (but not too much - some oily fish are known to be more likely to carry their own toxic burden, of heavy metals like mercury, due to environmental pollution.) Try and cook fresh daily, and do not eat overly large portions - huge meals are a 'huge' challenge to the physical system - and can not only exacerbate 'ageing' effects, the polluting effect of foods that lay in nooks and crannies of your bowel, due to regular overloading and slow digestive system - can lead to potential problems. It is good idea to go through a complete digestive-system ‘detox’ - then rebuild your gut flora using a beneficial genuinely organic pro-biotic food source (mail me for some info if you are interested in how to do this in more detail). NOTE: Taking supplements on top of an impaired system may, at the least have reduced effect, and at worst is like literally doing no more then throwing your money down the toilet!
(2) Avoid heavily polluted atmospheres, keep your own home environment as toxin free as possible - for instance - avoid using toxic-chemical based air-sprays, polishes, hair-spray, deodorants and room fresheners, etc. - avoid plug-in 'vaporizer' products that evaporate chemicals into your 'local' air. If you live in a city - it is a tough job trying to control the air you breathe - and some who have the money will resort to installing expensive air filtering systems...Yet by reducing chemical products used in your home to a minimum you can have a real effect on reducing your exposure to toxins - ban any propelled spray products, keep dust down, stop using talcum powder...take sensible precautions.
(3) Often still overlooked - if you want to reduce exposure to cancer causing chemicals - you MUST completely overhaul your 'bathroom products and cosmetics'...What use is there taking a 'vitamin pill' - if you are plastering your body with toxic creams, lotions, moisturizers, soaps, shampoos and conditioners, etc...??? This is amazingly important - as your skin will absorb up to 50% of what you put on it. It is far better to divert 'pill and vitamin' money to 'treat yourself properly' and buy the slightly more expensive products made ONLY with 100% natural ingredients - BUT beware there is a lot of 'false natural' claims out there. The products need to be made with NO chemicals, and ideally with Certified Organic ingredients (Otherwise he so-called natural ingredients may be derived from chemically-cultivated sources...therefore you may still be exposed to chemicals unwittingly). Please do get in touch if you want more info about finding these safer alternative products.
Do not be put off by those who are ignorant of the facts. Taking pills, potions and vitamins is of little real benefit (other than making you 'feel/think' you may be doing yourself some good) IF you have not sorted out your lifestyle and done all you can to REDUCE your exposure to toxins and toxic chemicals in your environment - via ALL 3 means described.
Mankind has introduced around 100,000 unnatural chemicals to our daily lives over less than 50 years. In this time CANCER has risen to all time high. You cannot avoid exposure to cancer causing agents (carcinogens) by taking pills - it is about REAL lifestyle change.
Cancer is essentially where normal body cells suddenly start reacting/reproducing in an aberrant way - forming tumours and growths - due to having been caused to mutate/ become 'sick' particularly when the body's normal immune response is compromised. Immune response is weakened (amongst other things) by the huge onslaught of chemicals that our systems have to deal with daily.
If your system is compromised and your lifestyle and environment are poor, then no number of pills and combinations of vitamins etc will be any real help.
Hope this is useful.