Heavy metals in greens powders: what batch testing covers
Plant powders concentrate whatever is in the soil, which is why heavy metal testing matters. What a batch report covers, what it misses, and how to ask for one.
Akanksha Singh
Plants take up what is in the ground they grew in. That includes minerals you want and metals you do not. Drying and milling removes water, which concentrates everything left behind. A greens powder is therefore a concentrated version of its own soil, and that is the whole reason heavy metal testing exists in this category.
Which heavy metals are tested in supplements
Four come up repeatedly: lead, arsenic, cadmium and mercury. They are not added by anyone. They occur naturally in soil and water, and they vary enormously by region, by proximity to industry and by irrigation source.
Leafy material and root material tend to carry more than fruit, because leaves and roots are the parts doing the absorbing. Algae are particularly good at concentrating what is in their water, which is why spirulina and chlorella sourcing is worth asking about specifically.
What a batch test report actually covers
A batch report is a laboratory result for one production run. For plant powders it usually covers two families of test.
Heavy metal limits
The four metals above, measured in parts per million or parts per billion, against a limit. India sets limits under the Food Safety and Standards regulations, and a compliant product sits under them.
Microbial limits
Total plate count, yeast and mould, and specific organisms such as E. coli and Salmonella. These test whether the material was handled and dried cleanly.
That is the standard pair. It is a meaningful test and it is also narrower than most people assume.
What batch testing does not tell you
A heavy metal and microbial panel says the powder is within safety limits. It says nothing about whether the ingredients on the label are present in the amounts implied, whether the extract matches its standardisation figure, or whether the formula does anything.
Those are separate tests, and most brands do not run them. A product can pass every batch test and still be a proprietary blend of cheap filler.
So testing is a safety floor. It is necessary, it is not a quality argument, and a brand that presents a clean heavy metal report as proof of a good formula is changing the subject.
Per batch versus once
This is the distinction that separates real testing from testing as marketing.
Soil varies by harvest. A supplier who was clean last season may not be this season. Testing once, at launch, and citing that certificate for two years tells you about one batch that is long gone.
Ask which batch the report covers, and check the date against the batch code on your pouch. If they do not match, you have been sent a different product's paperwork.
How to ask a brand for a batch report
One email does it. Ask for three things:
- The heavy metal and microbial report for the batch code printed on your pack
- The name of the laboratory that ran it
- Whether testing is done on every batch or on a sample of batches
The answer to the third question is the revealing one, and it is the one least often volunteered.
How SWATVA tests its batches
SWATVA blends and packs in India in an FSSAI licensed, GMP certified facility, and batch reports cover heavy metals and microbial limits. We say exactly that, rather than implying the report covers potency or efficacy, because it does not. The label decoder sets out the other checks worth running on any supplement, ours included, and the ingredient list is public before you buy anything.
The first batch is one run of 55 pouches. Applying takes four minutes and nothing is charged.
55 seats.
Then it closes.
SWATVA makes two blends with every ingredient printed on the pack. Daily Greens for your everyday base, Signal for focus without caffeine. The first run is 55 pouches, and applying costs nothing.