The BHB range of nutritional ketosis has been suggested to be 0.5–3.0 mmol/L and sometimes slightly higher (26), but a ceiling has been reported in humans at ≈6–7 mmol/L, which is reached after weeks of fasting (4).
12.5g of ketone esters is… tiny… (https://juvlabs.com/blogs/ketosis-metabolism/the-science-behind-juvenescences-breakthrough-product-metabolic-switch has a suggested dose of 12.5g - this is Eric Verdin’s supplement)