From the members I have conversed with, they are forbidden from using caffeine.
> It took a great deal of time, repetition, patience; no small amount of hope and faith; lots of reassurance from my wife; and many liters of a diet soda that shall remain nameless.
[0] https://www.churchofjesuschrist.org/study/general-conference...
There are a whole lot of people who have their own interpretations of the commandments, and that coupled with our history of secrecy surrounding the temple could definitely give rise to the idea that it's difficult to know what all the requirements are, but it's all online and available to everyone at this point.
Here's the relevant information about the health code[1]:
> The Lord revealed in the Word of Wisdom that the following substances are harmful:
> Alcoholic drinks (see Doctrine and Covenants 89:5–7).
> Tobacco (see Doctrine and Covenants 89:8).
> Tea and coffee (see Doctrine and Covenants 89:9; latter-day prophets have taught that the term “hot drinks,” as written in this verse, refers to tea and coffee).
[0] https://www.churchofjesuschrist.org/temples/what-is-temple-e...
[1] https://www.churchofjesuschrist.org/study/manual/gospel-topi...
> I am a member, and every actual commandment is definitely public record. Even the temple covenants are (as of recently) public record[0], and those used to be the ones that were held in the highest level of secrecy.
Great! So here's a very legit question: is there a PDF version that I could read linearly to get a good idea of the whole doctrine? (I mean something like the Talmud)
I'm just curious and want to learn.
Beyond that, the Gospel Topics[1] section is, as you found, a bit of a rabbit hole, but contains the church's official stance on any topic where they've taken a stance. If you can't find it there, it's likely that there isn't an official consensus.
[0] https://www.churchofjesuschrist.org/study/handbooks-and-call...
[1] https://www.churchofjesuschrist.org/study/manual/gospel-topi...