Scalp irritation, dryness, and contact dermatitis occur in a subset of users, more commonly with the liquid formulation (which contains propylene glycol) than with foam
NAD+ (Cellular Energy & Longevity) NAD+ is essential for energy production, DNA repair, and brain health
If you have a severe deficiency, you should talk to your doctor about therapeutic injections or prescription pills
However, many peptides currently being discussed in wellness and longevity medicine are not FDA-approved for the uses commonly promoted in those settings
The recommended daily allowance (RDA) for vitamin C in the UK is 40-90mg per day (depending on what you read) so 500mg per injection is quite a large amount (though less than 1000mg daily is not though to be harmful - but might increase the possibility of side effects)
Until the FDA takes one of these steps, the committee vote should not be read as nationwide permission to make or dispense these peptides