Cost is the wrong variable, and I think that is why so many people stall on it.
The number that matters is not your monthly spend. It is your cost per milligram, because the monthly spend only rises when you raise the dose, while the $/mg is what you can actually control.
A concrete example using our own catalogue, because it is the only set of numbers I can vouch for:
Tirzepatide, per vial, shipping not included, single-vial price:
5mg $48 -> $9.60/mg
10mg $67 -> $6.70/mg
30mg $134 -> $4.47/mg
60mg $236 -> $3.93/mg
Same peptide, same laboratory, same certificate format. The 5mg vial costs 2.4x what the 60mg costs per milligram. Nothing about the molecule changed. What changed is that somebody had to fill, cap, label, pack and ship a vial for 5mg of powder, and that fixed cost gets divided by five instead of sixty.
So the practical answer to "should I go up to 1mg" is: at 1mg a week you use about 4.3mg a month. That is $29 a month at the 10mg price and $17 a month at the 60mg price. Going from 0.5mg to 1mg costs you roughly fifteen dollars a month in real terms, not double your bill. The doubling feeling comes from buying the same small vial more often.
Two things that are worth checking before anyone quotes you a $/mg figure, including mine:
First, $/mg assumes the vial contains what the label says. We have a tirzepatide certificate on file that came back at 94.95% purity with 14.15mg measured in a vial labelled 10mg. If you divide price by the label, that vial looks like the best deal on the page. If you divide by the measured content, it is 1.4x cheaper than it appears and also not a clean product. Ask for measured content, not just purity percentage.
Second, the 10mg vial is the worst value per milligram in almost every compound, and it is exactly the size people start with because they are not committed yet. That is not a conspiracy, it is fixed cost per vial, but it does mean the first purchase is usually the most expensive one per mg you will ever make.
Source of the prices above is my own list, so treat it as one data point rather than a market rate. If anyone wants to post theirs in the same format (compound, vial mg, price per vial, shipping in or not, measured mg if you have a certificate) I will keep a table and post it back. I would rather have five honest lines than nobody's opinion.