You want to be the kind of person who takes care of her body, so you put collagen in your coffee and electrolytes in your water. I do the same thing (almost) every day.
Before adding another supplement to the cart because it's trending, it's worth asking a different question first: what is your body actually low in?
Research analyzing U.S. women found that 41% of women aged 19–50 were at risk of at least one vitamin deficiency or anemia, highlighting how common nutrient gaps can be.
While collagen and electrolytes get most of the attention, 4 nutrients consistently show up in research as commonly under-consumed in women, and they're tied to things most of us deal with weekly: how you sleep, your energy, your mood, your focus.
The Nutrients Many Women May Be Missing
Every woman is different. Some may be low in one of these nutrients, while others may not be. That’s why bloodwork and personalized guidance can be so helpful. The goal isn’t to self-diagnose, but to become more aware of the foundations that support overall health.
Magnesium, iron, vitamin D, and B12 all play a role in energy, recovery, mood, sleep, and overall function. Here's how to spot if you might be running low in each.
1. Magnesium
Between stress, highly processed foods, and modern eating habits, many women simply aren't getting enough magnesium consistently. Magnesium is involved in hundreds of processes throughout the body, including sleep, muscle recovery, stress regulation, energy production, and digestion.
Best food sources:
Pumpkin seeds, almonds, cashews, spinach, leafy greens, and dark chocolate.
If you're low, you may notice:
- Trouble falling or staying asleep
- Muscle tightness or cramps
- Fatigue that doesn’t fully lift
- Feeling more anxious or stressed than usual
- Constipation or sluggish digestion
If you're considering a magnesium supplement, magnesium glycinate is often a great place to start because it's generally well tolerated and easy to absorb. Most women notice shifts in sleep and mood within 1-2 weeks of consistent use.
2. Vitamin D
Vitamin D is one of the most commonly low nutrients for women, driven by factors like desk jobs, sun exposure, diet, and age; 67% of Americans aren't getting enough. Vitamin D is important as it supports immune function, bone health, mood regulation, and your energy levels.
Best food sources:
Sunlight, fatty fish, egg yolks, fortified dairy or plant milks.
If you're low, you may notice:
- Low or flat energy
- Frequent illness or catching colds easily
- Mood dips, especially in darker months
- Muscle weakness or heaviness
Iron levels are best checked before supplementing since both low and high levels can cause issues. If you are deficient, it typically takes 4-8 weeks to notice improvement.
3. Iron
Iron is especially important for women who menstruate because it’s lost monthly through the cycle. It plays a key role in carrying oxygen through the body, which directly impacts energy, focus, and physical endurance.
Best food sources:
Red meat, poultry, seafood, lentils, beans, spinach.
If you're low, you may notice:
- Persistent fatigue
- Brain fog or difficulty focusing
- Shortness of breath during normal activity
- Feeling weaker during workouts
- Slower recovery
Iron levels are best checked before supplementing since both low and high levels can cause issues.
4. Vitamin B12
Vitamin B12 supports energy production, brain function, and nerve health. It’s naturally found in animal foods, which is why intake can be lower in vegetarian or vegan diets.
Best food sources:
Meat, fish, eggs, dairy, fortified foods.
If you're low, you may notice:
- Fatigue or low energy
- Brain fog
- Tingling or numbness in hands or feet
- Mood changes
If you avoid animal products, B12 is one nutrient that often requires intentional supplementation. You may notice energy and mental clarity improvements within 2-4 weeks.
So, Where Do Collagen and Electrolytes Fit In?
This is where collagen and electrolytes come back into the conversation.
Both can be helpful. They’re just not where I’d start.
Collagen
I use it myself every morning, and I'm not cutting it out. But your body makes collagen using amino acids from protein, plus nutrients like vitamin C and iron. If those foundations are off, collagen supplements usually aren't the first place to start; they're support, not a substitute.
It tends to matter more if you're postmenopausal, highly active and putting stress on your joints, recovering from an injury, or already covering the basics above and want extra support for skin and joints. If you do supplement it, give it 8-12 weeks before expecting to notice a difference.
Electrolytes
Electrolytes are essential minerals that support hydration, muscle function, and nerve signaling. I use them when I’m traveling, in hot weather, and during intense workouts- basically when I know my body is losing more fluid than usual.
I also used them during pregnancy when staying hydrated felt more challenging, and supporting that balance became more important day to day.
For most people, though, they're not something you need constantly. They're supportive in specific situations, not a daily requirement. Unless you're in one of those specific scenarios (pregnancy, postpartum, intense exercise, heavy sweating), regular water and a balanced diet typically handle hydration just fine.
Not Sure Where To Start?
Before adding more supplements, it helps to zoom out first. A basic check-in with your doctor and routine bloodwork can give you a clearer picture of what your body actually needs support with. Start with getting tested for the four nutrients above. Once you know where you actually stand, you can make clearer choices instead of guessing.
My Takeaway
Collagen and electrolytes still have a place in my routine. They’re just not the first place I would look. Real progress doesn't come from adding more. Sometimes it comes from addressing what's missing.
Before adding another supplement to your cart, it’s worth asking:
Is this actually supporting my body or just something I’ve been told I should take?
Start with the foundation. Then build from there.