Sulforaphane vs Curcumin
Written by Aaron CuhaReviewed Sep 2026
The short answer
Two plant compounds with the same absorption problem and very different trial records. Curcumin has 103 trials across 42 results, with high certainty evidence for four. Sulforaphane has three trials that named their main goal in advance, and it missed all three.
- Sulforaphane people
- 423
- Sulforaphane nulls
- 1
- Curcumin people
- 195
- Curcumin nulls
- 0
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
7 completed trials, 423 people given it
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
3 completed trials, 195 people given it
First-hand reports are counted on each profile and never added together. This page sets two published records side by side. It does not pick a winner.
Column A
SulforaphaneSulforaphane, an isothiocyanate released from broccoli glucoraphanin
Three studies set a main goal in advance, and all three missed it. They tested a prostate cancer blood marker (PSA) in 78 men after surgery, fasting blood sugar in 74 adults with prediabetes, and autism again in 45 children. The clearest win in people is a urine marker. In Qidong, China, the top dose raised how much of a benzene breakdown product people flushed out by 63.2 percent.
Column B
CurcuminCurcumin (diferuloylmethane from Curcuma longa)
Across 103 studies and 42 health measures, only four had high-certainty evidence, including CRP, a blood marker of swelling. Curcumin barely gets into the blood, so the results belong to special high-absorption forms, not to turmeric.
Side by side, on the facts we can check
| What we compare | Sulforaphane | Curcumin |
|---|---|---|
| Category | Antioxidant | Antioxidant |
| FDA status | Not an approved drug for any use. Sold as a dietary supplement, usually as broccoli seed or sprout extract. The label amount is usually for glucoraphanin, the inactive starting material, not for sulforaphane itself. | Sold as a dietary supplement, and turmeric is generally recognised as safe as a food. Not approved to treat any condition. |
| Half-life | Roughly 2 hours in plasma after an oral dose, with most urinary metabolite excretion complete within about a day. | Very short for unformulated curcumin, with extensive first-pass conjugation and plasma concentrations often near the limit of detection after ordinary doses. Enhanced formulations report multi-fold increases in exposure, and those multiples are formulation-specific rather than a property of curcumin. |
| Molecular weight | 177.3 Da. An isothiocyanate, not a peptide. | 368.4 Da. Turmeric root is roughly 2 to 5% curcuminoids, so the spice and the extract are not interchangeable doses. |
| How it works | Sulforaphane flips a switch called NRF2. NRF2 turns on a large set of the body's own cleanup and antioxidant genes. That is why its most repeatable effect in people is helping the body tag and flush out toxins, not changing any disease. The pathway it turns on is, quite literally, a disposal system. Separate work found sulforaphane by matching a diabetic liver's gene pattern against 3,800 drug patterns. It cut sugar production in liver cells through the same NRF2 switch. The plant does not actually contain it. Broccoli stores the stable starting material, glucoraphanin, in one place and the enzyme myrosinase in another. Sulforaphane forms when the plant is damaged. That is why chewing and chopping matter, and why it matters whether a capsule has live enzyme in it. | Curcumin is a plant compound that sticks to a huge number of targets in a dish. That is part of its appeal. It is also a reason for caution, because things that stick to everything in a dish often do little in the body. Its best-backed actions: it turns down NF-kappa-B, a master switch for swelling signals, and it turns up Nrf2, which raises the body's own antioxidant defences. Its big problem is absorption. Plain curcumin barely gets in. The gut and liver change it fast, and the body clears it quickly. Every trick on the market exists to fix that: adding piperine from black pepper, binding it to fats (phytosomes), or shrinking it into tiny particles. Each one gives very different blood levels. |
| Studies in people | 7 | 3 |
| Evidence | Moderate: 7 completed trials, 423 people given it | Moderate: 3 completed trials, 195 people given it |
| Legal status, US | Sold as a supplement | Sold as a supplement |
Frequently asked questions
What is the difference between Sulforaphane and Curcumin?
Sulforaphane: Three studies set a main goal in advance, and all three missed it. They tested a prostate cancer blood marker (PSA) in 78 men after surgery, fasting blood sugar in 74 adults with prediabetes, and autism again in 45 children. The clearest win in people is a urine marker. In Qidong, China, the top dose raised how much of a benzene breakdown product people flushed out by 63.2 percent. Curcumin: Across 103 studies and 42 health measures, only four had high-certainty evidence, including CRP, a blood marker of swelling. Curcumin barely gets into the blood, so the results belong to special high-absorption forms, not to turmeric.
Which has stronger research evidence, Sulforaphane or Curcumin?
Each compound gets a band worked out from facts we counted, with the math shown. Sulforaphane is Moderate (7 completed trials, 423 people given it). Curcumin is Moderate (3 completed trials, 195 people given it). That counts how much has been done in people. It does not rate whether either one works, and neither one is called the winner.
Are Sulforaphane and Curcumin FDA-approved?
Sulforaphane: Not an approved drug for any use. Sold as a dietary supplement, usually as broccoli seed or sprout extract. The label amount is usually for glucoraphanin, the inactive starting material, not for sulforaphane itself.. Curcumin: Sold as a dietary supplement, and turmeric is generally recognised as safe as a food. Not approved to treat any condition..
Related posts
Blog articles that cover Sulforaphane or Curcumin, newest first.
Reviewed Sep 2026. This page puts two published records side by side. It is for learning, and it is not medical advice. When this site shows a dose, it is the dose a trial or a clinic actually used, or what people say they did, with the source attached. None of it tells you what to take.