California SB 1033 explained: the protein powder heavy-metal bill

SB 1033 is a proposed California transparency law for protein products. It would not ban protein powder, and it would not declare every product unsafe. It would force a cleaner paper trail. California Legislative Information SB 1033 bill text

If enacted in its current form, the bill would require manufacturers of covered bulk or packaged protein products sold, made, delivered, held, or offered for sale in California to test representative samples of each lot for arsenic, cadmium, lead, and mercury. California Legislative Information SB 1033 bill text

The important word is current. As of this review date, the official California status page lists SB 1033 as active in committee, with the last action on May 14, 2026. It is a bill to watch, not a rule brands already have to follow. California Legislative Information SB 1033 status

The bill's current text defines heavy metals as arsenic, cadmium, lead, and mercury. Those are the same toxic-element names buyers keep seeing in protein powder and greens-powder contamination stories. California Legislative Information SB 1033 bill text FDA environmental contaminants in food

The lab standard is not vague. SB 1033 would require testing at a proficient laboratory, including ISO/IEC 17025:2017 accreditation for heavy-metal testing, and a method at least as sensitive and specific as FDA Elemental Analysis Manual Section 4.7. California Legislative Information SB 1033 bill text FDA Elemental Analysis Manual for Food and Related Products

That matters because 'third-party tested' can mean a lot or almost nothing when a brand does not say who tested, what was tested, which lot was tested, which method was used, and what the numbers were.

The most consumer-useful part is the disclosure section. The current bill text would require brand owners to make the name and level of each heavy metal present in each tested lot publicly available on the same web page as Supplement Facts information and a heavy-metal statement. California Legislative Information SB 1033 bill text

It also says the heavy-metal testing information must be available without a UPC number, lot number, or proof of purchase. That is a big difference from the current treasure-hunt model, where a buyer may have to email support and hope the brand shares something useful. California Legislative Information SB 1033 bill text

The bill would also require package and online product-page language pointing consumers to the testing page for covered products sold on or after January 1, 2028. California Legislative Information SB 1033 bill text

Protein powder is no longer a niche bodybuilder product. It is in breakfast shakes, GLP-1-adjacent snacks, plant-protein tubs, ready-to-drink bottles, and wellness routines.

At the same time, heavy metals can occur in foods and dietary supplements because elements such as arsenic, lead, cadmium, and mercury can come from the environment, industrial uses, pollution, and ingredient sourcing. FDA environmental contaminants in food

Consumer Reports' 2025 testing of 23 protein powders and ready-to-drink shakes added pressure by putting brand-level lead findings back in front of shoppers. That reporting is not the same thing as a California law, but it explains why buyers are asking for numbers instead of badges. Consumer Reports protein powder lead testing

SB 1033 would not prove that every protein powder is dangerous. It would not make a product automatically clean just because it has a disclosure page. And it would not replace normal supplement skepticism.

FDA says it does not approve dietary supplements for safety, effectiveness, or labeling before they are sold. That is the boring regulatory fact behind a lot of supplement label drama. FDA 101 dietary supplements

A posted result still needs context: serving size, serving frequency, unit, lot, date, lab method, detection limit, and whether the product is something a buyer uses daily.

For label reading today, pair this with the COA heavy-metals interpreter and the lead in greens powder guide.