Not all beetroot supplements have the same amount of nitrate—some have so little that they probably won’t do anything noticeable for your body, like improve blood flow or exercise performance.
Evidence from Studies
Supporting (2)
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What's in Your Beet Juice? Nitrate and Nitrite Content of Beet Juice Products Marketed to Athletes.
Scientists tested popular beet juice products and found that most don’t have enough nitrate to actually help with exercise performance—some have barely any at all, even though they claim to.
What's in Your Beet Juice? Nitrate and Nitrite Content of Beet Juice Products Marketed to Athletes.
Scientists tested popular beet juice and powder supplements and found that most don’t have enough nitrate to actually help with exercise performance—some have barely a tenth of what’s needed.
Contradicting (1)
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The study gave people two types of veggie powder — one with lots of nitrate and one with little — and found both lowered blood pressure about the same. But it didn’t check if store-bought beetroot products have too little nitrate, so it doesn’t prove or disprove the claim.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.