Collagen shows measurable skin hydration changes around 4-8 weeks and structural improvements (elasticity, wrinkle depth) by 12 weeks in most RCTs
Then further maintenance doses every 4,6 or 12 weeks
If your vial is not in exceptional condition when it arrives send us a message at [email protected] for a refund
Angioni D, Middleton L, Bateman R et al (2025) Challenges and opportunities for novel combination therapies in Alzheimers disease: a report from the EU/US CTAD Task Force
Ten-panel and twelve-panel tests expand this list to include barbiturates, benzodiazepines, methadone, propoxyphene, methaqualone, and sometimes expanded opioid classes or additional stimulants
Using expired b12 could certainly result in you not receiving the proper dosage due to deterioration as you now likely suspect given your setback