Many Reformed still grant Adam supernatural gifts; du Moulin: revealed knowledge and constant help were supernatural
Although the Reformed teachers maintain that original righteousness was natural to the first man, many of them at least will not say that he lacked all supernatural grace and that God adorned him with natural gifts only. This is especially clear in Pierre du Moulin, in the disputation on the state of innocence cited above, theses 49 and 50.
"We do not deny," he says, "that there were some supernatural gifts in Adam. If he drew any knowledge from revelation, or had anything that human nature, however pure, could not reach without a special and extraordinary gift of God, that was without doubt supernatural, and Adam would not have passed it on to his descendants even had he persevered in his integrity.
"Again, there is no doubt that a man, however perfect his body's natural balance, needs supernatural help and God's constant aid to keep that good balance (eukrasia). In the same way, though Adam's nature was pure and holy, it still needed continual supernatural help to keep that purity, since even lifeless and irrational things are upheld by God's inflowing power."
Latin
XXXVII. Porro quamvis pertendant Doctores Reformati justitiam Originalem primo homini fuisse naturalem, affirmare tamen nolunt, saltem eorum complures, primum hominem caruisse omni gratia supernaturali, & non aliis quam naturalibus donis a Deo fuisse ornatum. Illud praesertim videre est apud Petrum Molinaeum, supra citata disputatione de statu innocentiae, thesi 49. & 50. Non imus tamen inficias, inquit, quin in Adamo fuerint quaedam dona supernaturalia. Nam si aliquam cognitionem hauserat ex revelatione: aut si quid habuit ad quod humana natura quantumvis pura non potuit pervenire sine dono Dei peculiari & extraordinario, id sine dubio fuit supernaturale: nec id Adam perstans in integritate ad posteros propagasset. Praeterea quemadmodum non dubium est quin homo quantumvis perfecto corporis temperamento naturali, opus habeat auxilio supernaturali, & Dei ope continua, ad servandam hanc εὐκρασίαν: ita etsi Adami natura esset pura & sancta, opus tamen habebat jugi auxilio supernaturali ad conservandam istam puritatem. Cum etiam inanimata & irrationalia divino sustentur influxu.