Scripture does not leave the preparation of anointing oil undefined. In the Law, God gave a specific and detailed prescription. The mixture was not left to human creativity, but was commanded by God himself, with measured ingredients and strict prohibition against imitation for common use (Exodus 30:22–33). This was not merely practical instruction. It was an act of consecration. The oil was holy because God set it apart.
Therefore, under the old covenant, both the composition and the use were prescribed. To alter it or reproduce it for ordinary purposes was to profane what God had declared sacred.
But you are right to see that this does not continue unchanged.
For the Law was not given as an end in itself, but as a shadow. The oil, the priesthood, the tabernacle, all pointed beyond themselves. The outward anointing signified an inward reality. It marked consecration, yes, but more deeply it pointed to the Spirit of God who alone truly sets apart, empowers, and sanctifies.
So when we come to the new covenant, the emphasis is no longer on the recipe, but on the reality to which it pointed.
As the apostle teaches, we have been anointed not with oil made by hands, but by God himself. The anointing we now receive is not a mixture of spices, but the Holy Spirit. This is the fulfillment. The sign gives way to the substance.
If one seeks to recreate the power of anointing through a physical formula, he returns to the very yoke that failed to save the fathers, placing weight again upon what was never meant to give life, but only to point beyond itself.
Remember that the power was never in the oil itself, but in the God who consecrates.
The question then becomes, not whether one has the right mixture, but whether one has been truly anointed by the Spirit of God.
For if the trust is in God, the oil remains a humble sign.
But if the trust shifts to the act itself, the sign has been corrupted.
For without him, the oil is nothing, but the believer himself or herself is set apart as holy unto the Lord.