How cells are delivered: IV, intrathecal & local

Intravenous administration places a product into the circulation. Distribution depends on product characteristics and biology; a claim that cells automatically home to every damaged organ requires product-specific evidence. Local intra-articular or soft-tissue injection places material near a selected site. Accuracy, sterility, imaging guidance and the underlying diagnosis matter, but local placement does not establish tissue regeneration or durable benefit. Intrathecal or other neuraxial administration is invasive and can carry serious neurological and infectious risks. It should never be treated as a routine upgrade and requires a lawful protocol, appropriate specialists and emergency capability. Intra-arterial, intracardiac, intramyocardial and intracerebral routes have distinct procedural hazards and are generally research or specialist-hospital decisions. Marketing access to a route is not evidence that it is appropriate. Oral, nasal, topical or inhaled products marketed with stem-cell or exosome language may not contain living cells and may fall under different regulatory categories. Obtain composition, manufacturer, intended use and authorisation rather than relying on the label. Dose should be stated with units, product identity and release specifications. A larger cell count is not automatically more effective or safer, and counts from different preparations are not directly comparable. Ask for evidence matching the same route, product, processing, condition and population. Results from intravenous cells cannot validate a local injection, and a study of one tissue source cannot validate another. Consent should describe route-specific alternatives, anaesthesia, imaging, immediate monitoring, adverse events and escalation. After administration, obtain the exact dose, route, site and traceability record.

Sources & further reading

• Stem-cell trials registry (ClinicalTrials.gov) ↗
• Peer-reviewed research (PubMed) ↗
• ISSCR — patient resources ↗
• FDA — consumer guidance ↗
• EMA — ATMP framework ↗

Educational guide; most uses are investigational. Verify the exact product, indication and provider with current regulator records and an independent qualified physician.