Learn more in our article on how to eat in a calorie deficit the right way
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B12 (typically cyanocobalamin or methylcobalamin) is placed directly into the muscle, so it is reliably absorbed into the bloodstream and carried to the cells that need it
If used, creatine is typically reserved for older teens (16+) involved in structured, competitive training, with appropriate adult supervision and a third-party-tested product
This designation is relevant to its use as a nutraceutical, not as an injected research compound
That will build your skills in working with other providers and understanding the full range of options for side effect management, both medically and nutritionally