“Does oil go before or after moisturizer?” sounds like a question with one answer for every bottle. A more precise question is: what does this particular formula say? Two collection references show why that distinction matters.
The bakuchiol reference
The directions for Natural Retinol Alternative Oil Serum, the reference behind IRIA · Bakuchiol Night Oil in WOOD, place it on clean skin, in the evening, as the final step. This is a published instruction for that product. It is not inferred from its commercial name or extended to other oils.
The nourishing reference
Nourishing Facial Oil, the reference behind RAIGAL · Nourishing Oil in EARTH, specifies morning and evening. It may be used alone or last after moisturizer, on clean skin while avoiding direct eye contact.
Here, “after moisturizer” genuinely appears in the formula-specific instructions. It does not establish that every oil from every brand always belongs there.
Drops are not measured millilitres
A direction expressed in drops helps with application. It does not, by itself, establish the volume of one drop or the duration of a 30 ml bottle. Converting drops into daily consumption would require a measurement of that dispenser and product, which is not presented here.
We therefore keep published use separate from bottle-duration calculations. A precise-looking number should not fill a measurement that does not exist yet.
Identify before combining
Note the formula reference, its time of use and whether it mentions other steps. When you change formulas, read again. WOOD or EARTH organises the collection; it does not replace individual instructions or confirm every possible combination.