Sulforaphane

Sulforaphane is not a molecule you eat directly from broccoli. Raw broccoli and broccoli sprouts contain glucoraphanin, a stable precursor, and myrosinase, an enzyme that converts glucoraphanin to sulforaphane only when plant cells are physically broken by chewing or blending. Cooking broccoli deactivates myrosinase before that conversion can happen, which is the mechanistic reason raw or lightly prepared broccoli and, especially, young broccoli sprouts deliver more usable sulforaphane than a cooked serving.

The most cited human trial is not about aging. In 2014, Singh and colleagues ran a randomized, double-blind, placebo-controlled trial giving 29 young men (ages 13-27) with moderate to severe autism spectrum disorder daily oral sulforaphane (50-150 micromol, dosed by body weight) for 18 weeks, against 15 on placebo [1]. Behavior, scored by parents and physicians on three standardized scales, improved substantially in the sulforaphane group: 34% improvement on the Aberrant Behavior Checklist (P<0.001) and 17% on the Social Responsiveness Scale (P=0.017), compared to under 3.3% change in the placebo group. When sulforaphane was stopped, scores drifted back toward baseline over the following four weeks, a pattern consistent with an active drug effect rather than a placebo response that would be expected to persist or fade gradually regardless of treatment arm.

What the evidence does not show: a later randomized trial testing sulforaphane in younger children with autism, ages 3 to 7, found no significant clinical improvement in the same class of behavioral outcome measures used in the original 2014 trial. That is an uncomfortable inconsistency for a single mechanism claimed to work the same way regardless of age, and it means the strong original result has not cleanly replicated across the age range where sulforaphane is now marketed to parents. Separately, on the food-versus-supplement question, a review examining dose and source directly concluded that the amount and bioavailability of sulforaphane a person actually absorbs depends heavily on preparation method, myrosinase activity of the specific plant material, and whether gut bacteria are relied upon to convert glucoraphanin in the absence of active plant myrosinase, meaning a broccoli-sprout supplement label's stated glucoraphanin content does not reliably predict delivered sulforaphane dose [2].

No verified Blueprint product page currently lists sulforaphane or broccoli sprout extract as a standing daily ingredient with a specific dose, so this entry attributes no self-experimentation claim to that program.

Critics of the autism sulforaphane literature note that the original 2014 trial was small (44 total participants), used a specific and narrow population (young men with moderate-to-severe ASD), and that its behavioral rating scales were completed by parents and caregivers who were, in principle, blinded but could plausibly have noticed physical or behavioral side effects that hinted at group assignment. The null result in younger children is the strongest available caution against generalizing the original finding.

The honest takeaway: sulforaphane produced one of the more convincing positive behavioral RCTs in this category, in a specific population of young men with autism, but a later trial in younger children found no significant benefit, and how much of it you get from a given serving of broccoli or a supplement label is not a settled question.

Products with this: Sulforaphane