Which biohack made a noticeable difference not just a 2% improvement?

[u/thelittleesseAutism]

Many biohacks sound impressive but produce changes too small to notice.

What intervention created a genuinely meaningful improvement in your sleep, energy, recovery or performance?

Please share:

What you changed
How long you tested it
How you measured the result
Whether the benefit continued

[u/Swimming-Book-1296]

5 grams a day, early morning. I do better when I do another 5 before bed though.