If you mean “Can one missed vitamin dose, after about 6 hours, unclog dangerous clots in an older person’s leg?” — no. Vitamins do not rapidly dissolve a deep-vein blood clot (DVT). A suspected DVT needs medical assessment, and treatment generally involves prescribed anticoagulants that prevent clots from growing and new clots from forming.
If a dose was missed 6 hours ago
The answer depends on what was missed:
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Vitamin/supplement: Missing one dose generally does not suddenly create or remove a clot. Do not take extra vitamin doses to try to treat a clot.
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Blood thinner (anticoagulant): This is much more important. Instructions differ between medicines such as apixaban, rivaroxaban, edoxaban, and warfarin. For example, NHS guidance says a missed apixaban dose should generally be taken when remembered and then continued normally, while warfarin has different instructions.
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Do not double the dose unless a clinician specifically tells you to. Taking extra anticoagulant can cause dangerous bleeding.
If the senior person actually has a suspected clot
A swollen, painful, warm, red/discolored leg—particularly one leg—can indicate DVT and warrants prompt medical evaluation. DVT can sometimes have few or no symptoms.
Call emergency services immediately if there is sudden shortness of breath, chest pain, coughing up blood, fainting, severe dizziness, or a very rapid heartbeat, because a clot can travel to the lungs and cause a potentially life-threatening pulmonary embolism.
If you tell me the exact vitamin/medicine name, dose, when it was supposed to be taken, and whether the person currently has leg swelling/pain or breathing/chest symptoms, I can explain what the 6-hour missed-dose situation means.