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Sodium borohydride(NaBH4) is a readily available, mild reducing agent and is easy to manipulate.1 On the other hand, reduction of disulfide to the corresponding thiol is an important reaction both in bio- and organic chemistry.2 However, disulfides can't be reduced by NaBH4 except those of limited structures3 such as lipoic acid.
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Ookawa et al. (1986) studied this question.
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