"The human body naturally produces trace amounts of gold (approximately 0.2 mg in an average adult)."
https://www.chicagotribune.com/consumer-reviews/sns-bestreviews-health-benefits-colloidal-gold-20210510-muelqughqjg35gnyeqituvji6e-story.html
"According the technical treatise, The Elements Third Edition, written by John Emsley and published by the Clarendon Press, Oxford in 1998, the average person's body weighing 70 kilograms would contain a total mass of 0.2 milligrams of gold. The volume of this gold in purified form would be 10 nanoliters. If this refined gold were formed into a solid cube of purified gold, the measurement of each side of the cube would be 0.22 millimeters."
https://www.gold-traders.co.uk/gold-information/how-much-gold-is-found-in-the-human-body.asp
"The amount of gold in your body is very tiny though.
For example, a 70-kg person has about 0.2 mg of gold, which is equivalent to 0.000000003% of their body weight. If you do the math, 5000 humans, in total, have about 1 g of gold. Not a lot.
Like majority of other trace elements, most of this gold is found in your blood. More than anywhere else though, it is concentrated in the regions around your heart."
https://freewithgold.com/natural-occurrence-of-gold-in-the-human-body
"Although iron is the most abundant metal in our body, traces of gold can be found in human body in several different places. These include brain, heart, blood, and our joints. If all the pure gold found in a human body whose weight is 70kg is collected, it can amount to 0.229 milligrams of gold. Although a high level of gold in our blood can cause toxicity, scientists have determined that gold does serve a function in maintaining the health of our joints in small amount. Besides that, gold is good conductor of electricity, which helps in transmitting electrical signals throughout our body. Therefore, the next time you feel down and worthless, remember that you’re a precious being and you’ve gold running in your blood and surrounding your heart!"
https://thepetridish.my/2021/02/15/how-much-gold-can-be-found-in-human-body/
"Precious metals like silver, gold, and platinum are all used in medicine to aid treatments as diverse as wound healing and cancer therapies.
Gold in particular is used for everything from imaging the human body to improving the immune system. Thankfully, its rarity is not a problem as tiny amounts make all the difference."
https://www.discovery.com/science/precious-medicine--gold-in-tiny-amounts-can-be-a-cure-all
"The actual point of human body containing Gold has recently been determined. It plays a vital role in health and maintenance of the joints. Also, being a good conductor of electricity, it actually helps in transmitting electrical signals throughout the body."
https://www.indiatoday.in/education-today/gk-current-affairs/story/gold-body-345917-2016-10-10