Supplements after gastric sleeve surgery aren’t a nice-to-have. They’re a genuine medical necessity.
The reduced stomach size and changes to how nutrients are absorbed mean that even with a good diet, you’re likely to become deficient in key vitamins and minerals over time without supplementation. The consequences of those deficiencies — fatigue, hair loss, bone density loss, nerve damage, anaemia — are serious and, in some cases, hard to reverse once they’ve taken hold.
Why You Can’t Skip This
Before surgery, your body absorbed nutrients across a large stomach surface area. After surgery, that surface area is dramatically reduced. Even if you’re eating the right foods, your body simply can’t extract as much from them as it used to.
This isn’t something you can compensate for through diet alone. Supplementation is a permanent part of post-op life, not a short-term thing.
What We Take
Our daily routine includes a high-quality bariatric multivitamin, which covers a broad range of micronutrients in doses appropriate for post-bariatric absorption. On top of that: vitamin D3 with K2 (especially important in UK winters), B12 (either sublingual or spray for better absorption), iron (Kirsten in particular), calcium citrate (split across the day, away from iron), and omega-3.
We get blood tests done regularly — at least every six months — to check our levels and adjust if anything is drifting out of range. This is important because you can feel fine and still be deficient; symptoms often lag behind the actual deficiency by months.
Making It a Habit
The biggest challenge with supplements is consistency. They’re easy to forget, especially on busy days or when you’re travelling.
We keep them visible — on the kitchen counter, not tucked in a drawer — and take them at the same time each day, attached to an existing habit like morning coffee. Building the routine around something already automatic makes it much harder to forget.
Disclaimer: This post is based on our personal experience and is intended for general information only. It should not be taken as medical advice. Every journey is different, and it’s important to speak with a qualified healthcare professional about your own circumstances before making any medical decisions.