Why make the swap

  • Why switch to steel shaker

    18/8 stainless steel. Inert, doesn’t hold odours, and lasts.

  • What's the concern with plastic shaker

    Polypropylene sheds microplastics, much more with heat and scrubbing.

  • General information, not medical advice. Ask your doctor, especially if you’re pregnant, nursing or have a health condition.

  • Good to know before you buy

    The lid is plastic. Your shake sits against steel, and the whisk is steel too. Never shake hot liquid in a sealed bottle.

  • Sources (1)
    1. Li et al. 2020, Nature Food: millions of particles per litre from hot PP bottles (opens in a new tab)

    Health and safety facts on this page come from this source. What a pick is made of comes from its maker's listing or website, as stated on the date we checked.

More gym swaps

Gym

Plant protein powder swap to Dairy-based protein

Two lab studies found more lead in plant-based protein powders than in dairy-based ones: about 3× in one, and 9× in the other.

Swap outPlant protein powder, the old item this swap replaces
swap to

Our pick

BSN Syntha-6 protein powder, Vanilla Ice Cream, 5 lb (48 servings)

Meets our bar

  • Fewer chemicals
See the swap: Plant protein powder to Dairy-based protein
All 3 gym swaps