Synapsin nasal spray gives me nosebleeds – is it safe long‑term?

Posted by greg208 in Safety & Side Effects - 6 points, 8 comments.

I started using the Synapsin nasal spray (Rg3 + NAD+ + methylcobalamin) about three weeks ago. The first few days were fine, except I got a mild headache and a pinch of irritation in the nose that went away with the next spray. After a couple of weeks I had a small nosebleed after the second spray of the day – it wasn’t severe but it was annoying.

I lifted the dose from 2 sprays per nostril twice daily to one spray per nostril twice daily and the bleeding stopped. I still get a little dryness and a taste change after each spray, and sometimes my nose feels congested. I’m not sure if the nasal irritation is a normal side effect or a warning sign for longer use.

Has anyone else had the same issue? What do you do to monitor or mitigate it? Would you suggest any changes in technique, dose, or a different delivery method?

Comments

• hank_m: Tbh the dryness I feel after every spray sounds familiar – I got the same thing when I first tried a nasal BPC‑157 mix. A little saline rinse between sprays usually eases the irritation, and switching to a single dose per day like you did can make a big difference. I’ve found keeping the spray bottle at room temp helps reduce the burning that can trigger a bleed. Do you notice any changes in your sense of taste or if the smell lingers longer? If the bleed or congestion keeps up, maybe a quick c
• sarah_c: Thanks for the tip, Hank. I’ve had the same dryness, so I started rinsing with a light saline spray between doses, big relief. I haven’t noticed a taste shift yet, but the scent does linger a bit longer after each spray. I’ll keep an eye on the bleed the way you suggest and will ask a GP if it persists.
• hank_m: Tbh i’ve heard nosebleeds from nasal sprays before, but it’s wild how specific the combo seems. For me, if i used any nose stuff regularly, i’d switch to saline flushes after to clear out any residue. Maybe try that? Or blow gently instead of spraying directly? Not sure if it’s a warning sign, but the dryness and taste change sound like irritation – same as when i first tried kpv for gut stuff, it felt like my nasal passages were conversing with my gut. Might be worth asking a doc if it bothers
• midwest_ironman: I’ve stuck with the lower dose and it’s worked for me too – just a single spray each nostril, twice a day. Saline flushes after do help, but I find just rinsing with a mild warm wash works fine. I’ve had the same dryness and taste shift, no more bleeding so I’m fine for now.
• greg208: Not gonna lie, the dryness still bugs me even with the single spray approach. I’ve tried saline flushes and a mild warm rinse too, but the taste shift stays. Have you added a nasal moisturizer or a mild steroid spray to keep the mucosa supple? Also, do you limit the total daily volume or any specific timing that helps avoid congestion?
• greg208: Thanks for the tip, hank_m. I’ll start doing a saline flush after each spray to clear any residue and see if that reduces the dryness and taste change. You mentioned blowing gently instead of spraying directly – I’ll give that a go too. Have you tried saline flushes with your own nasal‑spray routine, and did it help with irritation or bleeding?
• greg208: Nice to hear it’s helping, Sarah. I’ve found the saline rinse also cuts the dryness after a couple of sprays, but I still get a faint metallic taste for the first week – probably the methylcobalamin. I’ll try adding a tiny drop of a mild nasal moisturizer before the spray; let me know if that keeps the congestion down. Also keep the GP on standby, just in case.
• greg208: Thanks for the tip, Hank. I’ll start rinsing with saline between sprays and try keeping the bottle at room temp to cut the burning. I’ve already cut from two to one spray per nostril twice a day, but not a single dose per day, so I’ll test that too. The taste shift is still there; does that usually change with a different routine?

Community discussion - research and educational context only. Not medical advice.