More studies on cold water and dopamine

I’ve heard multiple mentions of the study “Human physiological responses to immersion into water of different temperatures” in your podcasts when talking about cold water exposure and dopamine. I was wondering if you had any more studies studying this specific relationship given that the study is from 20 years ago and had a small sample size.

Most important Health Products/Supplements for a Student with a Fixed Income

Greetings Professor Huberman, I love your podcast and the information you provide. I'm a 38-year-old undergrad, planning on graduate school for Psychology, I'm very interested in optimizing my brain and body health. I have been listening for a long time and I often hear you discuss certain products/supplements. Which one or two would you prioritize if forced to choose? I currently have limited financial resources, so I need to focus on what will be most beneficial for me overall. Thanks very much. you've been a great mentor/inspiration for me.

Natural Manipulation of SHGB

Any idea how to lower SHGB it without negatively affecting the HPTA ? Boron seems to work a little Perhaps Sauna use might nudge it down through the increase in Growth Hormone. Higher carb diet spiking insulin further. Appreciate the work you do !

PEANUT BUTTER, CURCUMA & TEFLON (?)

COMBO INQUERY: IS PB(it doesn't count as a nut butter?) detrimental to health (allergy aside obviously)?, is Curcuma supplementation a + or - (anti-inflammatory for e.g.)? and is using a scratched pan to cook a mortal error ? PS : Thanks for being AWESOME Dr.H Cheers, Marc Toth

Are wake up lights such as Philips HF3671 worth it?