Manganese Glazed

Vintage Redware Mini Pitcher Jug Figural Man Manganese Glaze
Vintage Redware Mini Pitcher Jug Figural Man Manganese Glaze
Paypal   US $88.99
1982 Redware Manganese Glazed Creamer Breininger NR
1982 Redware Manganese Glazed Creamer Breininger NR
Paypal   US $44.99
Redware Foltz Manganese Glazed Pie Plate Sponged Rim NR
Redware Foltz Manganese Glazed Pie Plate Sponged Rim NR
Paypal   US $49.99
Foltz Candlestick Holder Manganese Glaze Sponge Decorat
Foltz Candlestick Holder Manganese Glaze Sponge Decorat
Paypal   US $99.99
1989 Manganese Glazed Redware Flower Pot Breininger NR
1989 Manganese Glazed Redware Flower Pot Breininger NR
Paypal   US $160.00
Breininger Redware Flower Pot Manganese Glazed Bird NR
Breininger Redware Flower Pot Manganese Glazed Bird NR
Paypal   US $195.00
Glazed Redware Bowl Manganese Sponge by Seagreaves NR
Glazed Redware Bowl Manganese Sponge by Seagreaves NR
Paypal   US $219.99

How far beyond the "best before date" is it safe to continue taking vitamin suppliments? What are the risks?

For example, is it riskier with some vitamins compared with others? Such ingredients often can include:-

Ginsenosides (ginseng extract)
Dicalcium Phosphate
Magnesium Oxide
Potassium Chloride
Vitamin C
Ferrous Fumarate
Vitamin E
Zinc Oxide
Niacin
Vitamin A
Pantothenic Acid
Manganese Sulphate
Lutein
Vitamin D
Vitamin B6
Beta Carotene
Cupric Oxide
Thiamin
Riboflavin
Vitamin K
Sodium Borate
Folacin (Folid Acid)
Potassium Iodide
Vitamin B12
Chromium Chloride
Sodium Selenate
Sodium Molybdate
Sodium Metasilicate
Sodium Metavanadate
Stannous Chloride
Nickel Sulphate
Microcrystalline Cellulose
Croscarmellose Sodium
Magnesium Stearate
Anti-caking Agent (Silicon Dioxide)
Povidone
Glazing Agents (Hydroxypropyl Methyl Cellulose, Carnauba Wax)
Colours (Titanium Dioxide, Iron Oxide)
Triacetin
Polysorbate 80

Thanks, and please, if you can, cite sources in any answers given (if you want a chance of getting marked as best answer).

If it says "Best Before" it means that it will be safe to use even years after the expiry, the vitamins will probably lose their.. ummm, "vitamins".. but they will still be safe to consume.
"Use By" is a strict time limit; foods like coleslaw may taste okay but be unsafe to eat where as eggs, although they have a Use By date, will tell you when they have gone off because they will stink of sulphur.