At least in the UK.
"According to Henriette, ‘Nettle seeds are adaptogens. They help with the general stress response, they strengthen the adrenals, and they’re loaded with minerals and trace elements’. As most of the hype around adaptogens has centred on exotic plants from far away lands it’s particularly nice to have such a great example growing abundantly here in the UK. I always think that the medicines we need most are the ones which are most abundant near where we live and in these stressed-out, sped-up times, for many of us nettle seed is no exception."
Here I've been tracking down goldenroot, and nettle seeds fill the bill!