Brands I've trusted over the years based off my own research of their standards and what Ive heard from other Doctors like Huberman, Patrick, Attia etc-

Now Foods, Doctor's Best, Thorne, Double Wood (Huberman said he used this brand for Tongkat https://smile.amazon.com/dp/B07TTDFXFV?psc=1&ref=ppx_yo2ov_dt_b_product_details), Pure Encapsulations. Ill add more if I think of them but those are my go to brands. Now Foods being the main one due to cost. Thorne I believe is considered the best of supplement brands but also the most expensive...for a reason.