Stocks slumped on Tuesday as the risk-off mood intensified amid tech valuation worries and interest rate uncertainty.

As consumers pivot towards premium, science-backed supplements, Nestle's mass-market vitamin brands struggle to attract buyers, facing industry fragmentation and regulatory uncertainties.

Matching those valuations will be a tall order amid a "huge wave" of interest by consumers in brands whose product claims have been rigorously tested in clinical settings, said Marley Brocker, an ...