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Selective delivery of curcumin to breast cancer cells by self-targeting apoferritin nanocages with pH-responsive and low toxicity

So, taking a B12 supplement may help, Cording says

Lee PY, Davidson BA, Abraham RS, Alter B, Arostegui JI, Bell K, et al

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Phase I pharmacokinetic and pharmacodynamic study of 17-allylamino, 17-demethoxygeldanamycin in patients with advanced malignancies

Some brands are developing protective coatings or delivery systems to address this, but the science isnt there yet for most products on the market
