While there are UNDECLARED ingredients of C-19 injections, there are also some declared ones that are RUO (Research Use Only), which are potentially harmful according to their own SDF:
SM-102 SAFETY DATA SHEET lists following HAZARDS:
H302 Harmful if swallowed Acute toxicity, oral Category 4
Warning
H315 Causes skin irritation Skin corrosion/irritation Category 2
Warning
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A
Warning
H335 May cause respiratory irritation Specific target organ toxicity, single exposure; Respiratory tract irritation Category 3
Warning
2089251-47-6|Heptadecan-9-yl 8-((2-hydroxyethyl)(6-oxo-6-(undecyloxy)hexyl)amino)octanoate| Ambeed https://ambeed.com/products/2089251-47-6.html
GHS Classification (nih.gov) https://pubchem.ncbi.nlm.nih.gov/ghs/