What Plant-Based Athletes Are Actually Missing Beyond Protein
The conversation around vegan and plant-based sports nutrition tends to start and end with protein. How much, from which sources, whether the amino acid profile is complete. Those are legitimate questions. They are also not the only questions worth asking.
There are five nutritional gaps that appear consistently in plant-based athletes, each with a distinct mechanism, and each one that protein powder does nothing to address. Understanding them changes how you think about supplementing on a plant-based diet.
Creatine
This one was covered in Monday's post on energy systems, but it is worth stating plainly here.
The body synthesizes roughly half its creatine internally from the amino acids glycine, arginine, and methionine. The other half comes from diet. Dietary creatine is found exclusively in meat and fish. Plant foods contain none in any meaningful quantity.
The result is that vegans and vegetarians consistently run lower baseline muscle creatine stores than omnivores. Research has confirmed this directly. It is not a physiology difference, it is a dietary one. And unlike most nutritional gaps, this one has a clear, well-researched, and effective solution in creatine supplementation.
The complication for a site like CuratedFit is that virtually all commercial creatine monohydrate is chemically synthesized from industrial precursors. It does not pass the CuratedFit Standard on origin. That does not make it unsafe. It means we do not list it, and we say so clearly. The gap exists and it is worth knowing about whether or not you choose to supplement it.
Vitamin D3
Most vitamin D3 in supplements is derived from lanolin, a waxy substance extracted from sheep's wool. The cholesterol in lanolin is converted to D3 through UV exposure. This is not a plant-based source.
Plant-based D3 exists. It is derived from lichen, a biological source that produces cholecalciferol through a similar UV conversion process. It is less common and typically more expensive than lanolin-derived D3, which is why most supplements use the lanolin version.
The distinction matters for vegans. The label says vitamin D3 either way.
Beyond sourcing, vitamin D deficiency is widespread across the general population and measurably more common in athletes training indoors or at northern latitudes. For plant-based athletes the sourcing question and the adequacy question both need answering.
Vitamin B12
B12 is not present in plant foods in a bioavailable form. This is not a gap that can be meaningfully closed through diet on a vegan diet. Supplementation is necessary, not optional.
The physiology behind B12 is worth understanding briefly. B12 is required for red blood cell formation, neurological function, and DNA synthesis. Deficiency develops slowly because the liver stores several years of B12, which means the consequences of inadequate intake often do not become apparent until the deficit is significant.
For plant-based athletes the question is not whether to supplement B12 but which form and dose. Methylcobalamin is the form most commonly recommended for supplementation. The dose required to compensate for reduced absorption efficiency at higher doses is higher than most standard supplements provide.
Zinc
Plant foods contain zinc. They also contain phytates, antinutrient compounds found in grains, legumes, and seeds that bind to zinc in the gut and reduce how much is absorbed. The bioavailability of zinc from plant sources is meaningfully lower than from animal sources at the same stated quantity.
This matters practically because the zinc requirement for athletes is higher than for sedentary individuals. Zinc is involved in testosterone synthesis, immune function, and protein metabolism. A deficiency does not need to be severe to affect recovery and performance.
The form of zinc in a supplement also matters. Zinc oxide, the form used in many lower-cost supplements, has lower bioavailability than chelated forms like zinc picolinate or zinc bisglycinate. Both the dietary gap and the supplementation form question are relevant for plant-based athletes.
Omega-3
Plant sources of omega-3 provide ALA, alpha-linolenic acid, found in flaxseed, chia, hemp, and walnuts. The body can convert ALA to EPA and DHA, the longer-chain forms associated with anti-inflammatory function and recovery. The conversion rate in humans is low, estimated at between one and ten percent for EPA and lower still for DHA, and varies significantly between individuals.
For omnivores, EPA and DHA come directly from oily fish and to a lesser extent from grass-fed meat. Plant-based athletes are largely dependent on the conversion pathway, which most research suggests is insufficient to maintain optimal EPA and DHA status on its own.
Algae-based omega-3 supplements exist and provide EPA and DHA directly from the source that fish obtain them from in the first place. This is both the plant-based solution and, arguably, the more logically coherent source regardless of diet.
What this means in practice
None of this is an argument against plant-based eating. It is an argument for knowing what the dietary gaps are and addressing them deliberately rather than assuming that a good diet plus protein powder covers the full picture.
The gaps above are consistent, well-documented, and largely addressable through targeted supplementation. The question is whether the supplements chosen to address them are themselves honestly formulated and clearly labelled.
That is the question CuratedFit exists to answer.
Later this week the Vegan Muscle Building basket goes live, mapping a product to each of the key gaps in plant-based sports nutrition. Every product in it has passed the CuratedFit Standard.
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