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Anchor New Zealand has just released a milk bottle with a black plastic layer to protect the milk from exposure to light, and thus from loss of "taste and goodness". Their chart: enter image description here from their website specifically shows test results relating to vitamin B2 loss.

However, their testing is based on 2000 Lux of light, which apparently is excessive for a supermarket. Secondly, milk is unlikely to be exposed to the full brightness of light for very long unless it's perhaps a variety of milk that doesn't sell quickly.

How much vitamin B2 is lost under typical conditions (ie a high-turnover product, quickly put into the fridge at home)? Has anyone actually measured the level of vitamin B2 remaining after, say, half the milk has been consumed under normal circumstances?

I note that they clearly label their graph as "an example", which is probably intended to avoid law suits while still aiming for an emotional response from the consumer.

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