Might be an unpopular opinion, but most lotions and hair oils are probably detrimental, in general. Unless you’re rubbing tallow or coconut oil or something on yourself.
Your skin is a semi-permeable organ and will ‘eat’/absorb many things that you put on it.
I would tend to say to abstain from as much as you can while DF’ing, but the Phoenix Protocol guy spends a decent amount of his DF days in a little cold water tub in his yard, so each individual has to make some judgement calls on where they, personally, draw the line for their particular health journey.