Vitamin B12 in Kollo's formula — what it does and doesn't do
Kollo Premium Liquid Marine Collagen contains vitamin B12 as part of its B vitamin complex. B12 is genuinely one of the most important vitamins your body relies on for daily function — and it's also one of the most oversold in supplement marketing. This article covers what B12 actually does, where supplementation genuinely helps, and where the "energy booster" and "mood improver" claims sometimes get ahead of what the evidence shows.
What B12 actually does in the body
Vitamin B12 (cobalamin) is essential for several functions:
- DNA synthesis — B12 is a cofactor in the methylation reactions the body uses to build DNA
- Red blood cell formation — inadequate B12 causes megaloblastic anemia (abnormally large red blood cells that don't function properly)
- Nervous system function — B12 supports the health of the myelin sheath that insulates nerve cells; long-term deficiency can cause neurological symptoms
- Homocysteine metabolism — B12 (with folate and B6) helps convert homocysteine into methionine, an amino acid the body uses in many processes
- Normal energy metabolism — B12 is used by cells to convert food into usable energy at the cellular level
Where you get B12 — including if you don't eat meat
B12 is almost exclusively found in animal-source foods. The best dietary sources are:
- Meat (beef, chicken, pork)
- Fish and shellfish (especially clams, sardines, salmon, tuna, trout)
- Eggs
- Dairy products (milk, cheese, yogurt)
For vegetarians who eat eggs and dairy, meeting B12 needs from food is usually achievable. For vegans, B12 needs to come from fortified foods (nutritional yeast, fortified plant milks, some breakfast cereals) or a supplement. This isn't optional — B12 deficiency on a strict vegan diet without supplementation can cause serious neurological problems over time. If you're vegan or plant-based, please talk to your doctor about B12 status and supplementation.
The adult RDA in the US is 2.4 mcg per day (2.6 mcg during pregnancy, 2.8 mcg while breastfeeding). Many people meet or exceed this from a mixed diet without thinking about it, but there are groups who reliably need to think about it more.
Who's most likely to benefit from B12 supplementation
- Older adults (50+) — reduced stomach acid production and intrinsic factor with age can meaningfully reduce B12 absorption from food. The National Institutes of Health specifically recommends that adults over 50 consider fortified foods or supplements
- Vegans and strict vegetarians — as above
- People with pernicious anemia — an autoimmune condition affecting B12 absorption; typically needs B12 injections or high-dose oral
- People with GI conditions — celiac disease, Crohn's, or after gastric surgery can affect B12 absorption
- People on long-term metformin (diabetes medication) — associated with reduced B12 levels; worth periodic monitoring
- People on long-term acid-suppressing medications (PPIs like omeprazole, H2 blockers) — can reduce B12 absorption from food
- Heavy alcohol consumption — affects absorption and status
Signs of B12 deficiency worth knowing
B12 deficiency can develop gradually. Common signs include:
- Persistent fatigue and weakness
- Pale skin or a slight yellow tinge (from the anemia)
- Shortness of breath, particularly on exertion
- Tingling, numbness, or "pins and needles" — often starting in the feet or hands
- Balance problems or unsteadiness
- Memory issues, brain fog, or difficulty concentrating
- Mood changes, including depression symptoms
- Sore, red, or smooth tongue (glossitis)
- Mouth ulcers
If any of these sound familiar and persistent, please see a doctor. B12 status is checked with a simple blood test, and deficiency is very treatable — but the neurological damage from long-standing deficiency can be permanent, so timely diagnosis matters.
Where B12 marketing sometimes overstates it
Featured Product
Premium Liquid Marine Collagen
10,000mg of clinically studied marine collagen daily, plus B1, B5, B6, B12, vitamin C, and l-lysine — a well-formulated daily supplement.
Shop Liquid Collagen →B12 alongside marine collagen — Kollo's formulation approach
Kollo Premium Liquid Marine Collagen delivers 10,000mg of Naticol® marine collagen peptides per daily sachet — the clinical dose used in the skin research. Alongside the collagen, the formula includes:
- Vitamin C — used by the body in collagen synthesis (specifically for proline and lysine hydroxylation, which turns amino acids into functional collagen)
- Vitamin B12 — supports normal energy metabolism and normal function of the nervous system
- Vitamin B1 (thiamin) — supports normal energy metabolism
- Vitamin B5 (pantothenic acid) — contributes to normal mental performance
- Vitamin B6 — supports normal energy metabolism and normal red blood cell formation
- L-lysine — an essential amino acid used by the body in protein synthesis, including collagen
The formulation is designed to provide the marine collagen at the clinically studied dose, plus supporting nutrients that fit into a daily wellness routine. Kollo's B12 isn't intended as a therapeutic dose for treating deficiency — it's a supportive amount for people whose overall B12 intake from food is likely adequate. If you're at risk of B12 deficiency (see the list above), please talk to your doctor about whether you need dedicated B12 supplementation at higher doses.
Every batch of Kollo is Informed Choice certified — independently tested for over 250 prohibited and potentially harmful substances. Not suitable for anyone with a fish allergy.
What supports normal energy and wellbeing beyond supplements
If energy and mood are what you're really looking to support, being straightforward about the fundamentals:
- Consistent 7-8 hours of sleep — the biggest single lever for energy and mood
- Regular movement — genuinely one of the most reliable interventions for energy and mood
- Adequate protein at meals — helps with steady energy through the day
- Vegetables, fruit, and whole grains — nutrient density supports energy metabolism
- Sensible caffeine timing — caffeine after noon can affect sleep quality
- Sensible alcohol intake — heavy alcohol reduces sleep quality and affects nutrient absorption including B vitamins
- Managing stress — chronic stress is a real drain on energy
- Sunlight exposure — supports circadian rhythm and mood
- Social connection — well-documented mood support
- Regular check-ups — including bloodwork if you have persistent fatigue
Frequently Asked Questions
Does B12 give you energy?
Adequate B12 supports normal energy metabolism — that's the honest structure/function claim. If you're deficient, correcting that can meaningfully improve fatigue. If you're not deficient, extra B12 doesn't act like caffeine or provide "bonus energy" — the body eliminates the excess. Persistent low energy deserves a medical workup rather than a supplement.
How much B12 do I actually need?
The US RDA for adults is 2.4 mcg per day. Pregnancy is 2.6 mcg, breastfeeding is 2.8 mcg. Many people meet this from a mixed diet without effort, but older adults, vegetarians and vegans, and people with certain medications or GI conditions may need more.
Do vegetarians and vegans need B12 supplements?
Vegans yes — B12 is almost exclusively found in animal foods, so vegans need fortified foods (nutritional yeast, fortified plant milks) or a supplement. This isn't optional; long-term B12 deficiency can cause serious neurological problems. Vegetarians who eat eggs and dairy can typically meet needs from food, but a supplement is a reasonable insurance policy. Talk to your doctor about your specific situation.
Should older adults take B12?
The National Institutes of Health specifically recommends that adults over 50 consider getting B12 from fortified foods or supplements. This is because stomach acid production and intrinsic factor decline with age, which reduces B12 absorption from food. If you're 50+ and have persistent fatigue, memory issues, or numbness/tingling, please have your doctor check your B12 level.
Does Kollo replace a dedicated B12 supplement?
Kollo includes B12 as part of its B vitamin complex to support overall daily nutrition alongside the marine collagen. It's not designed as a therapeutic dose for treating deficiency. If you have confirmed B12 deficiency, your doctor may recommend a dedicated high-dose B12 supplement or injections — Kollo's B12 wouldn't replace that. For general daily nutrition support, it's a helpful contribution.
More honest guides on collagen: collagen before and after pictures, why consistency matters in your collagen routine, why collagen becomes essential after 25, and is there a link between collagen and menopause.
Kollo Health was co-founded by Jenni Falconer — TV presenter, Smooth Radio breakfast host, ten-time London Marathon runner and host of the RunPod podcast. Read her story and why she created Kollo.
