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Zhou C, Zaman N, Li Y, Martinez-Arguelles DB, Papadopoulos V, Zirkin B, et al
If you would prefer to start out with sublingual forms and oral B12 then I recommend this supplement
The pharmacological reality of peptide degradation in the GI tract makes meaningful oral absorption extremely unlikely without specialized encapsulation technology (which is still largely experimental for peptides of this size)
It can also decrease the cellular action of circulating thyroid hormones, potentially interfering with medications like Levothyroxine used for hypothyroidism, which could paradoxically worsen fatigue if unmonitored
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